don't call LIST_REMOVE if group_leave message for user himself doubles for same group
Merge pull request #283 from felixonmars/dev

don't call LIST_REMOVE if group_leave message for user himself doubles for same group
fix crash in sys_g_message when msg->group is 0x0
don't show notify message if no msg->group
Merge pull request #284 from felixonmars/master

fix crash in sys_g_message when msg->group is 0x0
0.1e release

Signed-off-by: xiehuc <xiehuc@gmail.com>