Add diff-buffer-against-saved command
Bind ctrl_shift_s to save-as in default keymap
Default mode: Don't auto-indent within comment blocks
Add new Ruby bundle

Replaces the old basic Ruby mode. While not complete, it features
pretty good Ruby lexing, including interpolations and the like.

The mode also provides indentation support, which now seems to be pretty
solid. Will of course have to be tweaked a little bit more later.