Bugfix for STI, where item_for would search for child classname while add would insert an item with the parent classname
changed spec tests to accept last bugfix for STI
Update README with dropped support for Rails 3
Stop testing Rails 3 on Travis
Update required Rails version to ~> 4.0.0
Merge branch 'STI' of github.com:GhostGambler/acts_as_shopping_cart
Bump version to 0.2.0