Added template for Bower dependencies + extended New Project with Polymer JS
Merge remote-tracking branch 'refs/remotes/upstream/master' into support-bower
Moved global template vars from templates.dart to spark.dart
Merge remote-tracking branch 'refs/remotes/upstream/master' into support-bower

Conflicts:
	ide/app/spark.dart
Fixed some omissions / addressed comments in the previous commit
Improved dialog look

Partly addresses review comments
Merge pull request #1479 from ussuri/support-bower

UI + project template to add bower.json with Polymer/custom dependencies to main templates