[zh] Synchronize with English version

Synchronize with English version commit 9e0a6b9. 
Synchronize the description of new example.
[zh] Fix typo in 01-chapter7

Fix typo.
Correct some typos on chapter2
[zh-tw] Correct some typos on chapter2
Merge branch 'zh-tw' of https://github.com/brickgit/progit into zh-tw
Update 01-chapter5.markdown

typo
Merge pull request #814 from zhukangyi/patch-1

[zh] Synchronize with English version
Merge pull request #815 from zhukangyi/patch-2

[zh] Fix typo in 01-chapter7
Merge pull request #816 from brickgit/zh-tw

[zh-tw] Correct some typos on chapter2
Merge pull request #817 from klern/patch-1

[zh-tw] Correct a typo in 01-chapter5
Merge pull request #818 from brickgit/master

[zh-tw] Correct some typos on chapter3