Setup generator, and spree_auth_devise and spree_core to work with spree 2-2-stable
Puts spree gem before than using auth_devise to solve problem with partials
Removes file required that doesnt exist
Implements new calculator and promotion for specific product with option
values

- Adds javascript option picker for admin section
- Adds required migrations
- Adds Calculator, rule and actions for this new promotion type
- Loads new classes for spree application
- Adds a new endpoint for option values
Merge branch 'master' into 2-2-stable

Conflicts:
	Gemfile
Merge branch '2-2-stable'

Conflicts:
	config/locales/en.yml
Implements rspec test suite

- Adds factories to use them on the rspec tests
- Tests the new calculator class
- Tests the new promotion action and rule
- Modify the spec_helper file in order to fix the deprecation warnings