This merges functionality that was previously stored in the
combination of PBGitCommitController / PBChangedFile to a
dedicated controller, PBGitIndexController.
This adds a div in the webview to display the current commit
state. It allows us to notify the user of new commits by
showing something in the webview, rather than a modal
dialog.
This changes the HTML part of GitX to be more consistent -- we
now use a "views" directory where every web view has it's own
directory.
Furthermore, GitX-wide Javascript is added in the "lib" directory.
The same is true for CSS in the "css" directory. Every view can
have its own custom CSS and JS, and those are put in the views
directory (without JS or CSS prefix directories).
This causes trouble if a file was partially staged,
or if we switch from the staged changes to the
unstaged changes.
It should be quick enough not to matter anyway, so
let's simplify things and remove the check.