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git换行符, 不用自动转换

1. https://github.com/cssmagic/blog/issues/22
2. http://blog.caoyue.me/post/git-line-ending

git忽略已经入库的本地文件修改

• git update-index --assume-unchanged FILENAME
• git update-index --no-assume-unchanged FILENAME
• http://chen.junchang.blog.163.com/blog/static/634451920131893846980/