GROOVY-6841: Fix NPE during compilation if scope is null
Raw modifications to run Groovy on Android
   * replaced uses of java.beans with openbeans
   * added a bytecode postprocessor
   * commented code which triggered NPEs on Android due to security exceptions
   * Repackage openbeans within core jar
   * Android patch: Catch introspection errors
   * Use "grooid" classifier for modified jars
Merge pull request #436 from melix/feature/grooid

Raw modifications to run Groovy on Android
GROOVY-6846: DGM.retainAll() has wrong generic type on Closure condition