bumped to 2.3.2-SNAPSHOT.
Correction to NPE when enum property type set to null.

This commit also include unit tests for enum property type in general.
Merge pull request #42 from asaf/enumNPEAndTests

Correction to NPE when enum property type set to null.
Update CHANGELOG.textile

For https://github.com/tinkerpop/frames/pull/42
fixed a map ordering bug in FramedVertexMap.
fixed a map ordering bug in FramedVertexMap.
CHANGELOG was in the wrong order.
the GremlinScriptEngine is now accessible from the GremlinAnnotation.
the GremlinScriptEngine is now accessible from the GremlinAnnotation.
merged 23 branch up to master.