upgrade to 0.9.0

fix socket.end bug

fix typo

update command

upgrade to 0.8.6

upgrade pomelo-rpc & pomelo-scheduler

fix bin/pomelo bug

bump version to 0.6.13

Change-Id: I192d78435475f4ca6df4826d7e4caa7d2efc5206

add tcp socket close option & upgrade pomelo-rpc & pomelo-schedule & …

…pomelo-admin

release 0.6.12

Change-Id: Ic9dce9c5ff3f06f115b045d566a17279e0a7b222