Allow user to specify a UIImage as the title for a nav bar button item.
Update readme to note that UIImages can be sent to create UIBarButtons
Update test app rakefile for RM2.0 syntax
Add tests for creating a UIBarButton with a UIImage.
One more test to make sure it's the RIGHT image ;)
Added tests for the left bar button item.
Merge pull request #67 from markrickert/version-0.6-imagebuttons

Allow user to specify a UIImage as the title for a nav bar button item.