Add Python3 simplified Chinese version.
Fix a typo, plus section headings
Finish most lines in section 1
A bit of section 2, 3, 4
All of section 6
Minor changes
Finish sections 2 and 3
Merge remote-tracking branch 'upstream/master'
Functions section
Only one section left!
Done with Chinese, mostly
Missed a few lines
Merge remote-tracking branch 'upstream/master'
Merge pull request #818 from geoffliu/master

[Python3/zh-cn] First section of the Python 3 doc for simplified Chinese