Add licenses to gemspec
Add licenses to gemspec

This should be enough to have it show up on rubygems.org
tobiashm/rack-contrib,edmorley/rack-contrib,gferguson-gd/rack-contrib,tobiashm/rack-contrib,vivrass/rack-contrib,vivrass/rack-contrib,edmorley/rack-contrib,gferguson-gd/rack-contrib