A lot of refactoring of controller, views, models, README, gemspec.

Moved feedbacks actions from application controller into new feedback_sender.
Updated views to use .erb instead of .haml.
Added initializer generator.
Updated gemspec, README and version.
Deleted unnecessary files.
Updated test/dummy app to working variant (only couple initializers needed).
Updated .gitignore
Added jquery-ui/dialog into application.js and .css.

Also added rspec-rails and using new resource style routes.
Moved and created new tests for feedbacks engine in the test/dummy app.
Updated README, added en.yml, deleted rails version restriction.

Also changed :match to :get route.