Add sessions Helper+controller for controlling sessions
Add sessions helper for finding current user from remember_token
Add remember token on before_save in User model
Create remember_token from SecureRandon.urlsafe_base64
Re-save all Users in db to add remember_token
Add signin helper - set current user and add remember_token to cookies.permanent
Add remember token for being signed in forever
Add sign_in automatically after create user
Add bootstrap.js in application.js
Change header layout to be dependent on sign in status
Add drop down menu to header layout when signed in
Create sign in form with form_for(:session), url POST goes to signin_path
Change User new form to POST to signup_path
Add route to POST with signup to:users#create, via:post
DB: Add column to users table with remember_token
DB: Add index on remember token
DB: rake db:migrate
TEST: Add test for user model to respond to remember_token
TEST: Add test to check remember_token should not be blank after user save
TEST: Add signin test with valid/invalid information
Finish sign in