Added support for mail notifications and WIP JIRA export.

app/com/ysoft/odc/SetDiff.scala

@@ -0,0 +1,8 @@
+package com.ysoft.odc
+
+class SetDiff[T](val oldSet: Set[T], val newSet: Set[T]) {
+  lazy val added = newSet -- oldSet
+  lazy val removed = oldSet -- newSet
+  lazy val isEmpty = newSet == oldSet
+  def nonEmpty = !isEmpty
+}