GRAILS-9899: Update Protobuf
Merge pull request #391 from bobbywarner/2.2.x

GRAILS-9899: Update Protobuf
fix for GRAILS-10308 "joinTable: with name: now not working after 2.1.5 upgrade to 2.2.4"
Merge branch '2.2.x'

Conflicts:
	grails-bootstrap/src/main/groovy/org/codehaus/groovy/grails/resolve/GrailsCoreDependencies.java
	grails-hibernate/src/main/groovy/org/codehaus/groovy/grails/orm/hibernate/cfg/GrailsDomainBinder.java