fix tcpsocket close event bug

Change-Id: I16c15916c49c6dc4ae6d8d7bc596df08da21aa14
fix error handle bugs

Change-Id: Icbc1e695e8b81843125d7981abb05f8e20f1dfc8
update to 0.3.8

Change-Id: I0fd061aec947a9b0e07b091d32c073ff59be3483
fix configure bug

Change-Id: I45bd0ebdc4ef7942ff2d7042524927bbcbd6c069
upgrade to 0.3.9

Change-Id: I1020d328013318984a05c6b29daf2c37256c3a76
pomelo-protobuf upgrades to 0.3.4

Change-Id: I7c699ba6c3a36cbe14c768b6b9c20b8a201c966f
Merge branch 'master' into 0.3.x-scheduler