style(animate demo): code cleanup
refactor(change_detection): remove unnecessary conditional expression

`prev` is guaranteed to not be null here, the method would throw noSuchMethod if it were.
fix(forms): do not reset input fields on valid submission
chore(docs): fix typos
chore(doc): build docs for angular/angular.dart repo only
fix(readme): Readd the Travis badge
fix(template_cache_generator): support traversal of partial files

Fixes #662
fix(NgForm): use map notation for controls and dot notation for instance properties
fix(NgForm): always return the first matching control when using map notation on a NgForm instance
feat(NgForm): provide access to non-uniquely named control instances via form.controls