Replace mysql with sqlite in test app
Add ActionColumn

Moved over from Communitypack and documented.
(Belated) version bump
Clean up gemspec-related code

Rakefile, gemspec. Make all tests run with `$ rake`.
Update travisci badge in README
Add gem version badge (thanks Gemfury)
Unfreeze Rails version
Fix rake exit status
Run migrations before tests
Using Sencha CDN is broken, disable
Merge remote-tracking branch 'netzke/master'