allow setting room notification, message template and notification color for each notification type (JENKINS-18127, JENKINS-28314, JENKINS-26974, #16, #54)
introduce default notifications (can be set under Global settings), which are only triggered if a job has no notifications set up (#30)
configuration stored in old format will keep on working
Expose failed and total test count in message templates, use $FAILED_TEST_COUNT and $TEST_COUNT respectively (#18)