Updated gemfile: removed better_errors to avoid local conflict in environment -BUG Ruby-

Updated path for the rspec as login and sign are now on the front page spec/features/user_spec.rb

updated controler redirect to pass test for bad signin
updated flash error message name to match signup and signin, in both view and controller
app/controllers/session_controller.rb
app/controllers/users_controller.rb
app/views/users/_login.html.erb
app/views/users/_signup.html.erb