generate proguard config from aapt -G and use it in proguard

as now aapt tool can generate proguard config with used system components
(Fragments, Views, Activities, Services and Application) we can use it in proguard task to
decrease custom proguard config
remove unnecessary proguard options, as they will be generated by aapt -G
Remove timestamp from snapshot version
Change package name to sbtandroid, following sbt-closure and sbt-dropbox-plugin
Change artifact name to sbt-android to match sbt-closure
[fix] No Apklib extraction for the provided scope
Add resPath task to allow specifying additional resource directories
Fix aaptGenerateTask to use resource dirs from resPath
Fixing aapt, idl and dx paths from new build-tools
Add build tools detection code from fxthomas