diff --git a/package-lock.json b/package-lock.json
index f39b5a9..8230f08 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -250,6 +250,11 @@
         "async": "2.6.0"
       }
     },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q=="
+    },
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       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.0.tgz",
@@ -262,6 +267,12 @@
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       "dev": true
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+    "aws4": {
+      "version": "1.11.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.11.0.tgz",
+      "integrity": "sha512-xh1Rl34h6Fi1DC2WWKfxUTVqRsNnr6LsKz2+hfwDxQJWmrx8+c7ylaqBMcHfl1U1r2dsifOvKX3LQuLNZ+XSvA==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/babel-cli/-/babel-cli-6.18.0.tgz",
@@ -1493,7 +1504,6 @@
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       "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
-      "dev": true,
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@@ -1591,23 +1601,70 @@
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-      "resolved": "https://registry.npmjs.org/coveralls/-/coveralls-2.11.9.tgz",
-      "integrity": "sha1-+f8Boa2/IqEp41qNYjRaUqeBs5U=",
+      "version": "2.13.3",
+      "resolved": "https://registry.npmjs.org/coveralls/-/coveralls-2.13.3.tgz",
+      "integrity": "sha512-iiAmn+l1XqRwNLXhW8Rs5qHZRFMYp9ZIPjEOVRpC/c4so6Y/f4/lFi0FfR5B9cCqgyhkJ5cZmbvcVRfP8MHchw==",
       "dev": true,
       "requires": {
-        "js-yaml": "3.0.1",
-        "lcov-parse": "0.0.6",
-        "log-driver": "1.2.4",
+        "js-yaml": "3.6.1",
+        "lcov-parse": "0.0.10",
+        "log-driver": "1.2.5",
         "minimist": "1.2.0",
-        "request": "2.67.0"
+        "request": "2.79.0"
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+          "version": "1.0.10",
+          "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+          "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+          "dev": true,
+          "requires": {
+            "sprintf-js": "~1.0.2"
+          }
+        },
+        "form-data": {
+          "version": "2.1.4",
+          "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.1.4.tgz",
+          "integrity": "sha512-8HWGSLAPr+AG0hBpsqi5Ob8HrLStN/LWeqhpFl14d7FJgHK48TmgLoALPz69XSUR65YJzDfLUX/BM8+MLJLghQ==",
+          "requires": {
+            "asynckit": "^0.4.0",
+            "combined-stream": "^1.0.5",
+            "mime-types": "^2.1.12"
+          }
+        },
+        "js-yaml": {
+          "version": "3.6.1",
+          "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.6.1.tgz",
+          "integrity": "sha512-BLv3oxhfET+w5fjPwq3PsAsxzi9i3qzU//HMpWVz0A6KplF86HdR9x2TGnv9DXhSUrO7LO8czUiTd3yb3mLSvg==",
+          "dev": true,
+          "requires": {
+            "argparse": "^1.0.7",
+            "esprima": "^2.6.0"
+          }
+        },
         "minimist": {
           "version": "1.2.0",
           "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "integrity": "sha512-7Wl+Jz+IGWuSdgsQEJ4JunV0si/iMhg42MnQQG6h1R6TNeVenp4U9x5CC5v/gYqz/fENLQITAWXidNtVL0NNbw==",
           "dev": true
+        },
+        "qs": {
+          "version": "6.3.3",
+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.3.3.tgz",
+          "integrity": "sha512-f8CQ/sKJBr9vfNJBdGiPzTSPUufuWyvOFkCYJKN9voqPWuBuhdlSZM78dOHKigtZ0BwuktYGrRFW2DXXc/f2Fg=="
+        },
+        "tough-cookie": {
+          "version": "2.3.4",
+          "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+          "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+          "requires": {
+            "punycode": "^1.4.1"
+          }
+        },
+        "uuid": {
+          "version": "3.4.0",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+          "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
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@@ -1862,8 +1919,7 @@
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-      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
-      "dev": true
+      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk="
     },
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@@ -2935,7 +2991,8 @@
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           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -2956,12 +3013,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -2976,17 +3035,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
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@@ -3103,7 +3165,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
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           "version": "1.3.5",
@@ -3115,6 +3178,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -3129,6 +3193,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -3136,12 +3201,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "5.1.1",
             "yallist": "3.0.2"
@@ -3160,6 +3227,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -3240,7 +3308,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
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           "version": "4.1.1",
@@ -3252,6 +3321,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -3337,7 +3407,8 @@
         "safe-buffer": {
           "version": "5.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
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@@ -3373,6 +3444,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -3392,6 +3464,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "2.1.1"
           }
@@ -3435,12 +3508,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
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@@ -3529,6 +3604,7 @@
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-2.0.0.tgz",
       "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
       "dev": true,
+      "optional": true,
       "requires": {
         "is-glob": "2.0.1"
       }
@@ -4045,7 +4121,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
       "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-finite": {
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@@ -4081,6 +4158,7 @@
       "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-2.0.1.tgz",
       "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
       "dev": true,
+      "optional": true,
       "requires": {
         "is-extglob": "1.0.0"
       }
@@ -4553,9 +4631,9 @@
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-      "resolved": "https://registry.npmjs.org/lcov-parse/-/lcov-parse-0.0.6.tgz",
-      "integrity": "sha1-gZ5dqL8HkfnT857qXtGGgYfxEXU=",
+      "version": "0.0.10",
+      "resolved": "https://registry.npmjs.org/lcov-parse/-/lcov-parse-0.0.10.tgz",
+      "integrity": "sha512-YsL0D4QF/vNlNcHPXM832si9d2ROryFQ4r4JvcfMIiUYr1f6WULuO75YCtxNu4P+XMRHz0SfUc524+c+U3G5kg==",
       "dev": true
     },
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@@ -4882,9 +4960,9 @@
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-      "resolved": "https://registry.npmjs.org/log-driver/-/log-driver-1.2.4.tgz",
-      "integrity": "sha1-LWLX+u9F2KcTQZYaBLB2HsqZz6M=",
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/log-driver/-/log-driver-1.2.5.tgz",
+      "integrity": "sha512-UwqFFU6yztduP6DXcjcIjrIyvWQMv/spvrK2vji37XiUykpCm1qTUUM3zO+ER7qjL3CtmbWKAoVC5+bO2HwiNA==",
       "dev": true
     },
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@@ -5051,14 +5129,12 @@
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       "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.33.0.tgz",
-      "integrity": "sha512-BHJ/EKruNIqJf/QahvxwQZXKygOQ256myeN/Ew+THcAa5q+PjyTTMMeNQC4DZw5AwfvelsUrA6B67NKMqXDbzQ==",
-      "dev": true
+      "integrity": "sha512-BHJ/EKruNIqJf/QahvxwQZXKygOQ256myeN/Ew+THcAa5q+PjyTTMMeNQC4DZw5AwfvelsUrA6B67NKMqXDbzQ=="
     },
     "mime-types": {
       "version": "2.1.18",
       "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.18.tgz",
       "integrity": "sha512-lc/aahn+t4/SWV/qcmumYjymLsWfN3ELhpmVuUFjgsORruuZPVSwAQryq+HHGvO/SI2KVX26bx+En+zhM8g8hQ==",
-      "dev": true,
       "requires": {
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       }
@@ -5896,8 +5972,7 @@
     "punycode": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
-      "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
-      "dev": true
+      "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4="
     },
     "q": {
       "version": "1.5.1",
@@ -6160,31 +6235,65 @@
       }
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     "request": {
-      "version": "2.67.0",
-      "resolved": "https://registry.npmjs.org/request/-/request-2.67.0.tgz",
-      "integrity": "sha1-ivdHgOK/EeoK6aqWXBHxGv0nJ0I=",
-      "dev": true,
-      "requires": {
-        "aws-sign2": "0.6.0",
-        "bl": "1.0.3",
-        "caseless": "0.11.0",
-        "combined-stream": "1.0.6",
-        "extend": "3.0.1",
-        "forever-agent": "0.6.1",
-        "form-data": "1.0.1",
-        "har-validator": "2.0.6",
-        "hawk": "3.1.3",
-        "http-signature": "1.1.1",
-        "is-typedarray": "1.0.0",
-        "isstream": "0.1.2",
-        "json-stringify-safe": "5.0.1",
-        "mime-types": "2.1.18",
-        "node-uuid": "1.4.8",
-        "oauth-sign": "0.8.2",
-        "qs": "5.2.1",
-        "stringstream": "0.0.5",
-        "tough-cookie": "2.2.2",
-        "tunnel-agent": "0.4.3"
+      "version": "2.79.0",
+      "resolved": "https://registry.npmjs.org/request/-/request-2.79.0.tgz",
+      "integrity": "sha512-e7MIJshe1eZAmRqg4ryaO0N9G0fs+/gpDe5FlbnIFy6zZznRSwdRFrLp63if0Yt43vrI5wowOqHv1qJdVocdOQ==",
+      "dev": true,
+      "requires": {
+        "aws-sign2": "~0.6.0",
+        "aws4": "^1.2.1",
+        "caseless": "~0.11.0",
+        "combined-stream": "~1.0.5",
+        "extend": "~3.0.0",
+        "forever-agent": "~0.6.1",
+        "form-data": "~2.1.1",
+        "har-validator": "~2.0.6",
+        "hawk": "~3.1.3",
+        "http-signature": "~1.1.0",
+        "is-typedarray": "~1.0.0",
+        "isstream": "~0.1.2",
+        "json-stringify-safe": "~5.0.1",
+        "mime-types": "~2.1.7",
+        "oauth-sign": "~0.8.1",
+        "qs": "~6.3.0",
+        "stringstream": "~0.0.4",
+        "tough-cookie": "~2.3.0",
+        "tunnel-agent": "~0.4.1",
+        "uuid": "^3.0.0"
+      },
+      "dependencies": {
+        "form-data": {
+          "version": "2.1.4",
+          "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.1.4.tgz",
+          "integrity": "sha512-8HWGSLAPr+AG0hBpsqi5Ob8HrLStN/LWeqhpFl14d7FJgHK48TmgLoALPz69XSUR65YJzDfLUX/BM8+MLJLghQ==",
+          "dev": true,
+          "requires": {
+            "asynckit": "^0.4.0",
+            "combined-stream": "^1.0.5",
+            "mime-types": "^2.1.12"
+          }
+        },
+        "qs": {
+          "version": "6.3.3",
+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.3.3.tgz",
+          "integrity": "sha512-f8CQ/sKJBr9vfNJBdGiPzTSPUufuWyvOFkCYJKN9voqPWuBuhdlSZM78dOHKigtZ0BwuktYGrRFW2DXXc/f2Fg==",
+          "dev": true
+        },
+        "tough-cookie": {
+          "version": "2.3.4",
+          "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+          "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+          "dev": true,
+          "requires": {
+            "punycode": "^1.4.1"
+          }
+        },
+        "uuid": {
+          "version": "3.4.0",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+          "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
+          "dev": true
+        }
       }
     },
     "require-directory": {
@@ -7884,6 +7993,7 @@
       "dependencies": {
         "bignumber.js": {
           "version": "git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9",
+          "from": "git+https://github.com/debris/bignumber.js.git#c7a38de919ed75e6fb6ba38051986e294b328df9",
           "dev": true
         }
       }
@@ -7940,6 +8050,34 @@
             "safe-buffer": "5.1.1",
             "secp256k1": "3.5.0"
           }
+        },
+        "request": {
+          "version": "2.67.0",
+          "resolved": "https://registry.npmjs.org/request/-/request-2.67.0.tgz",
+          "integrity": "sha512-fzMRDWVEdMktE3foqvL4CBmC+AR8WvcP8pIPx6JSqqhWuPr+BxX9tKx4XiijfyeKtqqRMNpHDWqFMw4JlRPIJg==",
+          "dev": true,
+          "requires": {
+            "aws-sign2": "~0.6.0",
+            "bl": "~1.0.0",
+            "caseless": "~0.11.0",
+            "combined-stream": "~1.0.5",
+            "extend": "~3.0.0",
+            "forever-agent": "~0.6.1",
+            "form-data": "~1.0.0-rc3",
+            "har-validator": "~2.0.2",
+            "hawk": "~3.1.0",
+            "http-signature": "~1.1.0",
+            "is-typedarray": "~1.0.0",
+            "isstream": "~0.1.2",
+            "json-stringify-safe": "~5.0.1",
+            "mime-types": "~2.1.7",
+            "node-uuid": "~1.4.7",
+            "oauth-sign": "~0.8.0",
+            "qs": "~5.2.0",
+            "stringstream": "~0.0.4",
+            "tough-cookie": "~2.2.0",
+            "tunnel-agent": "~0.4.1"
+          }
         }
       }
     },
diff --git a/package.json b/package.json
index 54cf848..8a17606 100644
--- a/package.json
+++ b/package.json
@@ -149,7 +149,7 @@
     "bignumber.js": "3.0.1",
     "chai": "3.5.0",
     "check-es3-syntax-cli": "0.1.3",
-    "coveralls": "2.11.9",
+    "coveralls": "2.13.3",
     "cross-env": "1.0.7",
     "eslint": "2.10.1",
     "eslint-config-airbnb": "9.0.1",