force import TinkerGraph classes to Gremlin Server.

Not an optimal approach but trying to stabilize for M3.  See #205
Merge remote-tracking branch 'origin/master'
Drop some dead code from integration tests.
Config files for gremlin server needed to point to conf instead of config/
Remove an unused variable declaration.
VertexProgram no longer hard codes Serializable as the MessageType requirement. Will make this a GraphComputer.Feature -- requiresSerializableMessages().
TinkerPop 3.0.0.M3 release