Update byobu to 5.30

Hi!  I'm the upstream maintainer of Byobu and I just released 5.30.  I would appreciate it if you could pull this update into Homebrew.

As an aside, the tarball now contains my first attempt to create an Applications/Byobu.app.  I couldn't quite figure out the appropriate way to have homebrew install this (it's not handled by 'make install').  If possible could you have the formula copy it into ~/Applications?  Thanks!

:-Dustin