Add ability to create a new user
Fixing layout and table printing of users index
removes ability to show individual user profile
Add base session controller files
Add routes for user authentication
Add form for new users and links to signin on home page
Add signin / signout methods to user
Add current_user helper method and use to show signin/out links on application
Add automatic login after signing up
Require user to be logged in to view secret page
Add email normalization for users accounts and signin