http://blog.csdn.net/slvher/article/details/50414675
http://blog.csdn.net/ns2250225/article/details/43765929
http://www.cnblogs.com/MacoLee/p/5680672.html
http://fabric-chs.readthedocs.io/zh_CN/chs/usage/execution.html#defining-tasks
https://github.com/bicofino/fabric-examples/blob/master/fabfile.py
https://gist.github.com/mahmoudimus/384895
