Start Chapter 2
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Translate the first section(getting-a-repository) of Chapter 2.
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Start translate chapter 1
translate: A Short History of Git
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Updated 01-introduction
Finish introduction.
Merge pull request #3 from Lax/translate

Merge from Lax/translate for Chapter 1.
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Merge from alamier/master for tanslating Chapter 2.
Finish 01-introduction/introduction.
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