gradle update to 1.12
use latest build tools
updated sdk to 3.14.1
do not build javadoc as it fails
added 3.14.1 in readme
Use exact version of bolts
added transitive dependency explanation
fixes latest gradle plugin incompatability. Closes #12
Merge branch 'master' of github.com:mente/facebook-api-android-aar

* 'master' of github.com:mente/facebook-api-android-aar:
  added transitive dependency explanation
  added 3.14.1 in readme
build script update to latest android plugin
3.15.0 release
3.16