Merge pull request #1 from Polymer/master

5/14 master -> stable
Merge pull request #2 from Polymer/master

5/15 master -> stable
Merge pull request #3 from Polymer/master

6/5 master -> stable
Merge pull request #5 from Polymer/master

6/17 master -> stable
Merge pull request #7 from Polymer/master

7/11 master -> stable
Merge pull request #8 from Polymer/master

8/1 master -> stable
Merge pull request #9 from Polymer/master

8/1 master -> stable round 2
fix submodules to point to stable branch
8/8 master -> stable
update projects and polymer-elements for sandbox launch
Merge branch 'stable'

Conflicts:
	polymer-elements
	projects