Ogre bumped to TinkerPop 3.2.1

[Stephen Mallette]

I just bumped Ogre to TinkerPop 3.2.1 on the master branch. 3.2.1 was release in mid-July and was the first release of TinkerPop outside of Apache Incubator. It didn't take much effort to get the upgrade in place. I just had to add a few new tests to adjust for additions to the TinkerPop test suite.