Apply small adjustments to AuthnRequest and AuthnRequestParams

Since all the getters of AuthnRequestParams are protected, it makes
sense for the getAttributeConsumingServiceSelector to be protected as
well.
Also, implement AuthnRequest(settings) constructor with a call to
another non-deprecated constructor.

Author: mauromol

core/src/main/java/com/onelogin/saml2/authn/AuthnRequest.java

@@ -52,9 +52,10 @@ public class AuthnRequest extends AuthnRequestParams {
 	 *
 	 * @param settings
 	 *            OneLogin_Saml2_Settings
+	 * @see #AuthnRequest(Saml2Settings, AuthnRequestParams)
 	 */
 	public AuthnRequest(Saml2Settings settings) {
-		this(settings, false, false, true);
+		this(settings, new AuthnRequestParams(false, false, true));
 	}
 
 	/**

core/src/main/java/com/onelogin/saml2/authn/AuthnRequestParams.java

@@ -163,7 +163,7 @@ protected String getNameIdValueReq() {
 	/**
 	 * @return the selector to use to specify the Attribute Consuming Service index
 	 */
-	public AttributeConsumingServiceSelector getAttributeConsumingServiceSelector() {
+	protected AttributeConsumingServiceSelector getAttributeConsumingServiceSelector() {
 		return attributeConsumingServiceSelector;
 	}
 }