add tests for signin
add test for invalid signin
include Sessions helper in controllers
generate migration to add remember_token to users
add remember_token to table
add remember_token tests and creation
set up and save token function in sessions helper
add bootstrap javascript library
add check if user is signed in
add what shows when signed in or not
fix test typos
move signout test to after signin
add bootstrap, previous commit had error
add remove token when signout
add destroy for signout
add sign in user upon sign up
add tests for after saving user they should be signed in
fix typo of click_link to button and have_content to selector