Errors and messages are displayed to the user for each cart_record acted upon in the cart
  - errors in red
  - messages in green
carts_controller transmits cart_messages in the flash to show
annotation and project_affiliated_record message tweaked for better readability
project_affiliated_record_test tweaked to match message (kind of annoying)
added p.alert and p.notice which match #notice and #alert (maybe can combine and make more general than p)
  to stylesheet
ALL TESTS PASS