Added method to close RexsterClient connections.

See discussion toward the end of inthefabric/RexConnect#7 for details.
updating rexpro to v1
updating rexster client to v1
adding console meta key
removing graphson response message
removing rexpro channel
removign console response message
renaming MsgPackScriptResponseMessage to ScriptResponseMessage
removing more channel references
fixing rexster console
adding json serializer templates
switching to jackson
adding serializerID method
adding initial json templates
adding serializer config to rexster client
switching out client serializer
switching out client serializer
moving rexster integration tests
creating class hierarchy for running integration tests for each serializer
adding integration tests for json serializer