Adds devise gem. Adds shared/_falsh_area partial.
Runs devise user generator.  Adds :user_name. Adds sanitizer to application_controller.
Runs devise migration
Creates devise views
Changes devise erbs to haml
Adds user_name to registration forms
Toggles reconfirmable off
Stops grabbing capybara from git
Disables rspec warnings because of circular import that I can' figure out
Adds presence and uniqueness of validations
Adds capybara/rspec to rails_helper
Adds initial tests for user model.  Configures factory for user model.