参考资料：
http://zh-sphinx-doc.readthedocs.io/en/latest/tutorial.html
http://avnpc.com/pages/writing-best-documentation-by-sphinx-github-readthedocs
http://www.ibm.com/developerworks/cn/opensource/os-sphinx-documentation/
http://blog.csdn.net/xubeiqiannian/article/details/50166529
http://www.open-open.com/lib/view/open1417416756706.html