Update dependencies to use newer versions in sync with floodlight
Comment/annotate DatapathId class as immutable
Merge into master from pull request #98:
Updated dependencies to newer versions consistent with floodlight core (https://github.com/floodlight/loxigen/pull/98)
Merge into master from pull request #97:
A few fixes in openflow_input for enums, and add support for type OFGroup in java_gen (https://github.com/floodlight/loxigen/pull/97)
Merge branch 'master' of github.com:floodlight/loxigen into funnel

Conflicts:
	java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/DatapathId.java