upgrade to groovy 2.0.6
update GrailsCoreDependencies.java
Merge pull request #323 from johnrengelman/groovy-2.0.6

upgrade to groovy 2.0.6
Merge branch '2.2.x'

Conflicts:
	build.gradle
	grails-bootstrap/src/main/groovy/org/codehaus/groovy/grails/resolve/GrailsCoreDependencies.java