fix(Angular.js): Improve logic powering isArrayLike()

[its-your-favorite]

Enable isArrayLike() to correctly identify one-off-arrays (aka
'subclasses').
Thus array-like objects with enhanced prototypes can be used with
ng-repeat.
Previously, they would be misidentified as objects and not iterate
correctly.

[dcherman]

Rather than make my own PR I figured I'd add this on here - I'm wondering it'd be worth using the battle tested definition of arrayLike from jQuery ( https://github.com/jquery/jquery/blob/master/src/core.js#L828-L843 ).

[its-your-favorite]

So I tested jQuery's function and it works for my test case too, so that would be a satisfactory for my use case.

I'm not sure why this hasn't gotten any response yet. Should I make a test-case to justify this PR?

[pkozlowski-opensource]

PR Checklist (Minor Feature)

• Contributor signed CLA now or in the past (if you just signed, leave a comment here with your real name for cross reference)
• Feature improves existing core functionality
• API is compatible with existing Angular apis and relevant standards (if applicable)
• PR doesn't contain a breaking change
• PR contains unit tests
• PR contains e2e tests (if suitable)
• PR contains documentation update
• PR passes all tests on Travis (sanity)
• PR passes all tests on ci.angularjs.org (cross-browser compatibility)
• PR is rebased against recent master
• PR is squashed into one commit per logical change
• PR's commit messages are descriptive and allows us to autogenerate release notes (required [commit message

[pkozlowski-opensource]

@anfurny Thnx for this PR. To move it further we will need unit tests. Also please have a look at the checklist above.

[pkozlowski-opensource]

@anfurny ping. Are you planning to add unit tests for this PR?

[chirayuk]

Ping …

[dcherman]

I'll do this sometime next week if tests aren't added between now and then, just didn't want to steal @anfurny 's thunder here.

[petebacondarwin]

Closing in favour of #3356, since that one has unit tests.