Writes out users/new view
Allows for mass-assignment of User.password
Fixes error with @user variable
Fixes problem with User information not being displayed upon unsuccessful save
Finishes UsersController#create (for now)
Adds UsersController#show and users/show view
Adds flash messages to the Application layout
Adds session routes
Adds SessionsController
Updates Routes
Adds SessionsController#create on valid credentials
Separates log_in functionality out of SessionsController#create
Adds SessionsController#create on invalid credentials