Issue #432:  added supporting code to enable calculation of Breakers in userNotificationService

This initial pull request provides some supporting code for issue #432, notifying pipeline breakers.  I made a minor modification in CcTrayStatus (change breakers calculation to public static method)  to allow StageNotificationService to caclulate the breakers when necessary.  I added some code to UserService to match users based on email address, and added tests for these changes.