Bump selenium-webdriver gem version to support Firefox 15
Update for new admin redesign

Fixes #21
Login success is a success, not a notice message
Use master spree
Must include current_order helper inside UsersController
Correct unauthorized checks in specs
Remove useless new action definition inside UserSessionsController
Include correct ControllerHelpers sub-modules into user_registrations and user_passwords controllers
Don't restrict to just master branch
Bump CanCan to 1.6.8