adding RexProMessage execute method to the RexsterClient
refactoring some of the session creation code to facilitate defining a graph object on the session
adding graph object definition functionality on the SessionRequestMessage Meta field
adding initial support for query isolation
adding support for script request level graph meta parameters
adding support for transaction flag
fixing rexster console query isolation (turning off)
Merge remote-tracking branch 'bdeggleston/master'
Auto-commit wasn't actually committing the tx in RexPro.

The tests didn't catch it because the RexPro integration tests only use Tinkergraph which is non-transactional.