facebook sdk submodule
gradle wrapper
build script for facebook aar
readme
facebook lib update to 3.5
readme build example update
facebook lib update to 3.5.2
Merge branch 'master' of github.com:mente/facebook-api-android-aar

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