Popups for success and failure

Adds trigger actions for displaying popups on success and failure, and corresponding messages specific to the situation. How does it look? @kadst43 @BrettASwift 
I'd want to be able to test greater than, less than, equal-to, in a range, not equal to, greater than or equal to, less than or equal to...  

We don't need all that right this second, of course - but that's the point. :)