android gradle plugin use always latest version
to drop
wrapper updated to 1.8
sources and javadoc generation in build script
facebook sdk update to 3.6.0
Merge branch 'master' of github.com:mente/facebook-api-android-aar

* 'master' of github.com:mente/facebook-api-android-aar:
  wildcard for facebook artifact in example
  added supported versions to readme