pomelo-protobuf upgrades to 0.3.4

Change-Id: I7c699ba6c3a36cbe14c768b6b9c20b8a201c966f
fix session.bind bug in backend server

Change-Id: I3bce5c5596441c56e75aff24536142989b1b1fd9
replace exec with spawn

Change-Id: I597f2b10c0c36e909b3ff2de1ffac3dd72e4bec6
upgrade to 0.3.10

Change-Id: I0a32a58e64087eaebf1f561174fa266076a882bc
clean code

Change-Id: I0e8e887c4bb8b392cc7bc8af2e0620405eae1d6b
Merge pull request #3 from NetEase/master

sync