Merge pull request #2 from vhf/master

sync with vhf:master
Merge pull request #3 from vhf/master

sync with vhf:master
Merge pull request #4 from vhf/master

sync with vhf:master
Added Markdown & reStructuredText in -zh.md
Merge branch 'master' of https://github.com/sunxb10/free-programming-books
fixed formatting
Merge pull request #1097 from sunxb10/master

Added Markdown & reStructuredText in -zh.md