brew up
Signed-off-by: Max Howell <max@methylblue.com> I removed whitespace changes and changed readlink to realpath as readlink raises if it's not a link.
I left update_from_masterbrew! as a historical reference.
I didn't change the class name, it's clear from the context where it is used what it does. However when just looking at files to figure out the nature of Homebrew I believe in clear naming. Otherwise funny names earn you points.
