Rails core - Jul 2009 - patch: adding uniq_by(proc) method for arrays to core_ext

I wrote a small patch to add an array.uniq_by(proc) method so that you
can select elements from an array based on their unique response to a
proc. It''s my first Rails patch, so I''d love any feedback /
reviews
you guys have.

http://is.gd/1OWLO

Thanks!

Joey Schoblaska