Merge pull request #2 from Melee7/master

modified readme
command list for pipline
pipeline for external command
Merge branch 'feature'
Merge branch 'master' of https://github.com/popol1991/user-sh

Conflicts:
	internalcmd.c
eliminate one memory leak
Merge pull request #1 from popol1991/master

合并框架作者更新