translated 1-git-branching.asc
Update 1-git-branching.asc

modified some mistakes
Update 1-git-branching.asc

modified quotes
modified some words
modified a mistake
translated the first 1/5
change the figure explanatory
translated to Switching Branches (1/2)
translated the first section -- nutshell
change the completion status
changed the translation of rebase
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其他 => 其它 && 分句 && —— => ，
Update nutshell.asc

修改几处错误和一些不恰单的翻译
Update nutshell.asc
修订了一些小错误
Merge pull request #11 from Jun995/master

The first pr for Chapter 3