Generate DemoController and write new_user method
Remove unused files
Add styled demo notices to pages
Demo user persists and redirects to the demo_user goals
Creating a goal for demo users redirects appropriately
Demo leads user from goal show to friend request page
Demo walks user through addition of foods to diary
Update demo flashes for complete daily entry
Create #remove_pending_request method for Friendship model
New friendships automatically generate messages
Demo walkthrough adds friend after journal is marked as complete
Finish demo account so it destroys itself after session termination
Ensure that demo accounts are destroyed upon new demo start