Add a "qt" type to ack to quickly search all Qt related files.
Add "git qr" as an alias for the "git quick-rebase" alias.

Aliases for aliases!
Enable autostashing for Git rebase.

This is very, very handy functionality for frequent rebasers like
myself.
Remove work specific --ignore-dir flags from .ackrc.

These are flags only makes sense on a development machine at work, so
they should live in my scripts there, not in my general purpose
dotfile repo.