No longer are LABEL, ID, KEY, VALUE reserved property keys. T.label, T.key, etc. are all the rage. Fixed #123
I just realized you can put methods on individual enums. This makes things much faster. Killer.
updated docs with new T model.
Merge remote-tracking branch 'origin/master' into io-pain

Conflicts:
	gremlin-core/src/main/java/com/tinkerpop/gremlin/structure/io/graphson/GraphSONReader.java
	gremlin-core/src/main/java/com/tinkerpop/gremlin/structure/io/kryo/KryoReader.java
	gremlin-test/src/main/java/com/tinkerpop/gremlin/structure/IoTest.java