add comment about require "skynet.c"
注释skynet.so这个lib加载了那些东西
update .gitignore
更新对handle的理解
minor comment on lua-int64/test.lua
comment on libskynet.so
minor comment on skynet_start
minor commit
Merge branch 'reading' into merge_reading

Conflicts:
	.gitignore
	lualib-src/lua-skynet.c
	skynet-src/skynet_start.c