Fixed part of issue 33.

The new dev build of Dart still doesn't work, but `enteredView()` is
getting called now. This means that our application does work with the
stable version of Dart... Yay!
Merge branch 'master' of github.com:turbowookie/turbo-wookie
Undid the new pathing for the unstable Dart stuff...

If that makes sense...
Turbo Wookie is now newest Dart version friendly.

I finally got it working and all I had to do was put a version
constraint on the polymer dependency.
Merge branch 'master' of github.com:turbowookie/turbo-wookie into new-frontend

Conflicts:
	frontend/turbo_wookie/pubspec.yaml
	frontend/turbo_wookie/web/dart/main.dart
	frontend/turbo_wookie/web/dart/media-bar.dart