add Sessions controller
add authentication_pages test
added signin page test
add route for sessions int route.rb
add action to sessions_controller
added view/sessions/new.html.erb and fixed typos in test and route
updated session test with valid signin test
update view/sessions/new.html.erb
update sessions_controller
update signin test with persistant error message test
update sessions_controller for successful signin
added remember_token to user model test
add remember_token to database through migration
update user model to create remember token
update session_helper
updated _header.rb for dropdown menu
updated application.js to require bootstrap
fixed errors to get test to pass
added test for after signup user is also signed in
sign in user after signup