not supporting rails 2 any more.
allows coveralls to post its data
#16 Including rack dependency
Gravatar.new("email@example.com").image_url fails without rack being installed.
Dropping official support for rails 2.x, and for Ruby 1.8 + variants Adding support for rails 4.x, and for Ruby 2.0 Testing on ruby-head is now allowed to fail. We'll continue testing on 1.8 for now, but won't make a major effort toward backward compatibility with 1.8.
Might be possible to drop this dependency and just raise a coherent error if file store can't be loaded.
Depend on Active Support