* FEATURE: Added cancel_on_false to timed event execution
  * Allows for cancellable events, despite infinite periodicity
* FEATURE: Timed_Event_Thread is now more dynamic to the addition of events after threads had previously been sleeping for the maximum allowed sleep time (5s).
* FEATURE: Added clear_queue to Timed_Event_Thread
* BUGFIX: Timed_Event comparison for priority queue is now functioning properly for ordering timed events
* FEATURE: Added delay to timed event execution, to allow for differences between period of event execution and when the executions begin
* Updated version to 1.5.2

git-svn-id: http://madara.googlecode.com/svn/trunk@1207 2850746a-f1c8-11dd-b507-8b4ecd5210be