Merge pull request #195 from qha0731/master

添加上scheme的入门教程，更好学习《计算机程序的构造与解释》
添加《GitHub秘籍》
Merge pull request #196 from spacewander/patch-8

添加《GitHub秘籍》
Create CONTRIBUTING
Update CONTRIBUTING
Rename CONTRIBUTING to CONTRIBUTING.md
Bootstrap 版 fixes #161 @siberiawolf
修改《编写Ruby的C拓展》的地址
添加《100个gcc小技巧》和《100个gdb小技巧》
Merge pull request #198 from spacewander/patch-9

修改《编写Ruby的C拓展》的地址
Merge pull request #199 from spacewander/patch-10

添加《100个gcc小技巧》和《100个gdb小技巧》
添加 《Apple Watch开发初探》 @nilsun
add c++ primer 5th answer
Update README.md
Merge pull request #201 from Mooophy/master

Add my Repo : C++ Primer 5th answers
w3school教程整理
Update README.md
Merge pull request #206 from withwind93/patch-1

thinkpython-cn @carfly
FreeBSD 使用手册 fixed #204
添加《Vim中文文档》