Add user stories samples
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
Fix PR mistake
Update code examples from Polymer project template
Fix warnings about Polymer HTML Import
Fix Polymer version to 0.12.0
Remove js scripts and html import from html template
Add build.sh script
'Step user-story-2'
'Step user-story-3'