Prepare gradle for two versions

This PR requires Android Studio 0.9+

If you want to build all releases from gradle:
1. create file release.properties in ../ with content:
  keyStorePassword=YourPassword
  keyAliasPassword=YourPassword
in terminal run
gradlew assembleRelease
Yes, in order to use buildflavors together will wear app packaging (they fixed that in 0.14.4)