Feature: Add support for ES.next Set, Map, ArrayBuffer

[ryan-roemer]

• Update library to include ES.next support for Map, Set, ArrayBuffer. Part of #36
• Update to fast-deep-equal@3.1.1 with modified support for ES.next data types.
• Note: There's a bug / limitation of Set comparisons whereby objects are compared by reference not value. Tracked at #50 . In our yarn benchmark, lodash.isEqual gets test differences because it correctly handles those.

Infrastructure

• Upgrade lots of devDependenices
• Use fast-deep-equal tests directly in our correctness tests.
• Update CI to modern Node.js versions.

[ryan-roemer]

IE test failures have been tracked to missing class support:

class MyMap extends Map {}

from upstream fast-deep-equals. Planning to ignore es6 tests in IE.

[ryan-roemer]

Update: We're now just failing at Appveyor with:

FAILED TESTS:
  advanced
    warnings
      basics usage
        ✖ never warns
          IE 11.0.0 (Windows 8.1.0.0)
        AssertionError: true === false
           at fail (test/browser/index.js:2472:3)
           at strictEqual (test/browser/index.js:2662:5)
           at Anonymous function (test/browser/index.js:63698:13)
           at Anonymous function (test/browser/index.js:63697:11)
           at Anonymous function (test/browser/index.js:63696:9)
    RegExp objects
      ✖ not equal RegExp objects (different flags)
        IE 11.0.0 (Windows 8.1.0.0)
      AssertionError: true === false
         at fail (test/browser/index.js:2472:3)
         at strictEqual (test/browser/index.js:2662:5)
         at Anonymous function (test/browser/index.js:63740:11)
[builder:finish] Hit 2 errors: 

It's the same failure, just in two different runs:

{
    description: 'not equal RegExp objects (different flags)',
    value1: /foo/,
    value2: /foo/i,
    equal: false
  }

[ryan-roemer]

FINALLY

[chrisbolin]

thanks @ryan-roemer! finally getting to this now