Adds haml-rails gem
Updates gemspec
Overrides checkout edit
Adds basic styling for spree single page checkout
Adds basic logic to handle javascripts responses
Decorates checkout helper
Removes unnecesary files
Updates readme
Fixes order state validation
Minor refactoring to step handler
Adds basic styles for loader
Merge pull request #1 from crowdint/2-2-stable

2 2 stable
Update dependencies and fix typo on class