feat(keys-and): ability to compare nested list objects

[Patrick-Ullrich]

This allows to run operations against nested object lists.

e.g.:

var subset = algebra.filterMembers(
        { filter: { 'employees': {name: 'Patrick' } }},
        [{
            projectId: 1,
            employees: [{
                name: 'Patrick',
            },
            {
                name: 'Justin',
            }]
        }, {
            projectId: 2,
            employees: [
            {
                name: 'Justin',
            }]
        }],
    );

    assert.deepEqual(subset, [{
        projectId: 1,
        employees: [{
            name: 'Patrick',
        },
        {
            name: 'Justin',
        }]
    }])

[eddypjr]

LGTM