Types: added 'matches' method to Masked<T>

+ IPv4 based unittest
Merge branch 'master' of github.com:floodlight/loxigen

Conflicts:
	java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/IPv4AddressTest.java
Merge into master from pull request #157:
Types: added 'matches' method to Masked<T> (https://github.com/floodlight/loxigen/pull/157)