changing the script filter to serialize messages before closing the transaction so titan objects can be sent back to the client
adding an check for null Session keys and returning an appropriate error
adding initial integration test graph iteration
updating script request integration tests to repeat once for each available graph
Merge remote-tracking branch 'bdeggleston/master'

Conflicts:
	rexster-server/src/integration/java/com/tinkerpop/rexster/AbstractRexProIntegrationTest.java

Added fix for checking if a graph is actually transactional using graph features.