feat(q): add isPromiseLike

[wesleycho]

• Add isPromiseLike public method for determining whether value is a promise-like object

This addreses #13372.

My only concern with this implementation is that IMO this doesn't really belong on $q, but maybe on the angular global itself.

[lgalfaso]

I expect that this change makes $q fail the Promise/A+ compliance test

On Saturday, December 26, 2015, Wesley Cho notifications@github.com wrote:

• Add isPromiseLike public method for determining whether value is a
  promise-like object

This addreses #13372 #13372.

My only concern with this implementation is that IMO this doesn't really

belong on $q, but maybe on the angular global itself.

You can view, comment on, or merge this pull request online at:

#13634
Commit Summary

• feat(q): add isPromiseLike

File Changes

• M lib/promises-aplus/promises-aplus-test-adapter.js
  https://github.com/angular/angular.js/pull/13634/files#diff-0 (1)
• M src/Angular.js
  https://github.com/angular/angular.js/pull/13634/files#diff-1 (2)
• M src/ng/q.js
  https://github.com/angular/angular.js/pull/13634/files#diff-2 (23)
• M src/ngAnimate/shared.js
  https://github.com/angular/angular.js/pull/13634/files#diff-3 (4)
• M test/ng/qSpec.js
  https://github.com/angular/angular.js/pull/13634/files#diff-4 (20)

Patch Links:

• https://github.com/angular/angular.js/pull/13634.patch
• https://github.com/angular/angular.js/pull/13634.diff

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#13634.

[wesleycho]

Removed the change to $q's $$resolve method - it does take away some of the motivation for this method being implemented though.

Some caveats - I'm not sure whether this function should be exposed on $q or angular. Another thing is that the change in ngAnimate appears to not be used, but if it were, it would have perf implications.