Change done.

Details:
 - com.wf.quartz.task.api bundle:
 	* Task and MultipleTask interfaces converted to abstract classes.
 	* ScheduledTask class added for schedule tasks in quartz.
 	* MANIFEST.MF updated to handle changes in bundle.
 - com.wf.quartz.job.service bundle:
 	* UniforceJobHandler interface renamed to QuartzJob
 	* UniforceJobHandlerWrapper renamed to QuartzJobWrapper
 	* Other bundles files adapted the changes.
 - com.wf.quartz.job.cron bundle:
 	* DummyTask and DummyMultipleTask added for testing.
 	* MANIFEST.MF file adapted the changes.
 	* CronJob class became a ScheduledTask
 	* Activator class adapted to changes.
 - com.wf.quartz.job.simple bundle:
 	* Adapted the renaming and altering operations.