Change "Interrupt again" message

Created by: alexch

When you hit ^C Rspec says "Interrupt again to exit immediately". This seems to indicate that you should interrupt again, so everyone I've ever paired with just keeps mashing ^C at this point. But if you just wait a second longer, RSpec will kindly show you the report of specs run up til now. This is a great feature and more people should use it!

This patch updates the message to indicate what great rewards await if you don't interrupt.