Don't cache equivalent converters in StructureModifier. 

This should hopefully fix a memory leak discovered by Stevenpcc 
(thanks).
Add a way to retrieve the underlying UUID in WrappedGameProfile.
Improve JavaDoc documentation of WrappedGameProfile.
Increment version to 3.4.0.
[TinyProtocol] Fix NULL player in the packet interception methods.
Added MassiveCore to the list of plugins exluded from the verifier.
Increment to 3.4.1-SNAPSHOT
Added support for Guava 11 (and later) in Spigot #1506-1508.

Note that build #1509 reverted to Guava 10, so this is merely a 
future proof.
Merge branch 'master' into cauldron

Conflicts:
	ProtocolLib/pom.xml