Use ECJ internally by groovy compiler and reuse generated classes (in work - needs cleanup)
Cleanup GroovyPlugin (some issues with hotswap, always full reload)
Ensure $staticClassInfo$ field in every groovy class
Compilation test - in progress
Remove Language from Source, refactor, prepare for more than one Java compiler.
Use and force groovy-all 2.06, fix ant build issues.
Groovy 2.1, Javac instead of ecj (better handling of Groovy stubs)