Update copyright.
Update maven publish.
Update Google Cloud Messaging README.
Update Google Cloud Messaging README.
Update README.
Update README.
Add GCM availability tests.
Change check is Google account need for platform version.
Fix check manifest for GCM.
Refactor test.
Update GCM version to 3.1.36.
Refactor GCM provider.
Refactor code.
Change adm jar on maven dependency.
Change artifact POM file.
Android gradle plugin to 0.13.3.
Refactor project structure. Rename modules.
Fix tests.
Update maven push.
Update README.