updated routes file for session resource, fixed application.html.erb flash messages, added session controller and test
added test for valid and invalid session, added new view for sessions
added spec for testing flash variable if it lingers between request
fixed session helper typos, added remember token to user model, fixed user model typo, added conditional header for sign-in-out
added signout test and updated controller to destroy session on sign out
added cucumber installation, and wrote sign-in-out features
added sign in and error checking helper functions in utilities.rb
finished signin