fix minor typos
Merge pull request #82 from justmarkham/typos

fix minor typos
Locking Conversations
Octicons
Add image to Octicons
Update Ja translation to 63cbfb9
Merge pull request #83 from hail2u/ja-translation

Update Ja translation to 63cbfb9
Update README.md
Merge pull request #84 from TheCellarRoom/master

Update README.md -> git internals pdf