chore($sniffer): replace remaining supportsTransitions/supportsAnimations flags inside tests
chore(ngdocs): update to new version of FontAwesome
feat(ngdocs): external links to github, plunkr and jsfiddle available for code examples
feat(ngAnimate): cancel previous incomplete animations when new animations take place
feat(select): match options by expression other than object identity

Extend ng-options with a new clause, "track by [trackByExpression]", which can be used when
working with objects.  The `trackByExpression` should uniquely identify select options objects.
This solves the problem of previously having to match ng-options objects by identity.
You can now write: `ng-options="obj as obj.name for obj in objects track by obj.id"`
The "track by" expression will be used when checking for equality of objects.

Examples:
<select
    ng-model="user.favMovieStub"
    ng-options="movie as movie.name for movie in movies track by movie.id">
</select>

scope: {
  user: { name: 'Test user', favMovieStub: { id: 1, name: 'Starwars' } }
  movies: [{ id: 1, name: 'Starwars', rating: 5, ... }, { id: 13, ... }]
}

The select input will match user favMovieStub to the first movie in the movies array, and show
"Star Wars" as the selected item.
feat($resource): collapse empty suffix parameters correctly

Previously only repeated `/` delimiters were collapsed into a
single `/`.  Now, the sequence `/.` at the end of the template, i.e.
only followed by a sequence of word characters, is collapsed into a single
`.`. This makes it easier to support suffixes on resource URLs.
For example, given a resource template of `/some/path/:id.:format`, if
the `:id` is `""` but format `"json"` then the URL is now
`/some/path.json`, rather than `/some/path/.json`.

BREAKING CHANGE: A `/` followed by a `.`, in the last segment of the
URL template is now collapsed into a single `.` delimiter. For example:
`users/.json` will become `users.json`. If your server relied upon this
sequence then it will no longer work. In this case you can now escape the
`/.` sequence with `/\.`