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

Merge from Lax/translate for Chapter 1.
Merge pull request #2 from alamier/master

Merge from alamier/master for tanslating Chapter 2.
Finish 01-introduction/introduction.
Update introduction. Add translation notes.
Add notes for translators.