Translate 06-github/1-github
Translate 1-setting-up-account
Translate 2-contributing
translate 3-maintaining
Translate 4-managing-organization
Translate 5-scripting
Tweak translation (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438667)
Tweak translation (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438716)
Fix typo (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438815)
Fix typo (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438828)
Tweak markup (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438869)
Fix typo (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438880)
Fix typo (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438890)
Correct mistranslation (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438917)
Fix typo (ref: https://github.com/progit/progit2-ja/pull/10#discussion_r21438931)
Merge pull request #10 from m-takagi/translate-06-github

Translate Chapter6 "GitHub"