Finished user model exercises
Added initial user new page
Added initial error notification on invalid signup
Added redirect on succesful sign up
Added flash messages to app template, flash welcome message on sign up
Added integration tests for user signup
Finished signup exercises
Added session controller
Added initial sign in functionality
Added user sign out
Finished sign in/out features
Added sign in integration function
Add user edit/update index and destroy actions
Finished user REST actions