ARC-ify and switch to ButteredDisk submodule
switched to https submodule url
cleaned up about box code
ARC tweak from review
Fixed unsafe_retained and removed unnecessary ivars, modernized things up a bit.
Upped deployment, tweaked delegate call, cleaned up some ivars
Merge pull request #1 from jfro/buttered-disk

ARC-ify and switch to ButteredDisk submodule