App CSS styles now go through the shadow roots.
The pubspec.yaml now points to the correct file.
Added mandatory imports and updated templates links accordingly.
Workaround : applyAuthorStyles don't work anymore, we need to include the stylesheet in the components.
Missing image part in edit template.
Correctly iterate inside a table.
No need to return Game on save and delete.
Added a brief description for the toObservable call.
Merge pull request #7 from vferries/master

Update to match Polymer 0.12.0
Fix #4 
Fix #5
Fix #6