reverted origin/lion merge (NSRegularExpression support)

I haven't fully tested it, so I'm not sure if it works in all cases
(or rather: I'm pretty sure it doesn't), and I don't want to spend
time on this now, I just want to do a quick bugfix release.
reverted recent changes to third party libs

something is breaking the app and I’m not sure what…
updated to latest (unmodified) MASPreferences
make the app work with latest MASPreferences
silenced some weird psitoolkit import errors
removed useless xcode setting
removed growl info panel

I don’t know how to make the view scale properly now when it appears
or disappears, so whatever…
[#51] load commit diffs asynchronously