move platform.mk out from makefile
netpack for gate
rewrite watchdog/agent, use new gate
rewrite client demo by lua, remove old C version client demo
c/s json protocol example
Merge pull request #84 from cloudwu/netpack

lua version gate and new example
remove old client
Merge branch 'netpack'
Fix Issue #86
fix include path for lua-cjson and add cleanall target
cleanall clear lualib.a
Add low priority list to socket send buffer
simplify send_buffer
Merge pull request #87 from cloudwu/priority

Add low priority list to send buffer
fixnetpack

不一定两次读完。没有读完的时候把uc放回queue。
snax : a simple skynet auxliliary framework
hotfix snax supported
use a patch to hotfix
queue mode
no return value for exit()