Take some of the original git package code, add a model, and use etch.

Goal is to prototype:

• https://github.com/atom/design/issues/35
• https://github.com/atom/design/issues/36

git clone git@github.com:atom/git.git
cd git
apm install
apm link -d
atom .

cd ../some-dir-with-a-git-repo
atom -d

• cmd-shift-c Opens changes panel

• right on a file focuses hunk
• select hunks with up or down
• enter to stage hunk
• / to toggle line selection mode
• shift-up or shift-down to expand line selection
• a to select lines
• enter to stage selected lines
• backspace while on a changed file (not the diff) will prompt to discard changes
• o on a changed file or hunk/line will open that file in a tab