add MAX_SLOT_SIZE limit
Fix issue #109
remove unused pingqueue
Merge branch 'master' into dev
Merge branch 'master' into dev
bugfix: stdin is 0
update PTYPE_* macro
use skynet_error for memory dump
lua service launch错误时，移除services中记录

lua service launch错误后,没有移除 launcher.lua里services中的服务记录，导致debug_console中的list mem等命令返回数据不正确
Merge pull request #112 from zhoukk/master

remove services when launch error.
update history
Merge pull request #113 from cloudwu/dev

bugfix
fix the missing of 'Welcome to skynet' in example
Merge pull request #114 from tangyi/minor-fix

fix the missing of 'Welcome to skynet' in example
update lua-bson to fix the 32bit signed int bug
concurrence bugfix
cluster support
single node mode
daemon mode
add pidfile for daemon