GROOVY-6440: Upgrade to Gradle 1.9
GROOVY-5385: ensure mop helper method for super does not delegate to covariant method
GROOVY-6405: patch to help Groovy on GE with JDK8
refactoring in order to remove deprecation warning for "RepositoryHandler.mavenRepo()"
GROOVY-6411: Make direct method call to bridge methods from closures