Fixed problem with serialization of TimeOfDay when EndTimeOfDay was null (occurred when running the Quartz core project's SmokeTestPerformer against the MongoDB JobStore)
Fixed RemoveTrigger to correctly handle situations where the JobDetail cannot be loaded correctly. This is important for example if the class referenced does not exist anymore and cannot be instantiated correctly. Discovered this issue while testing the MongoDB JobStore with Quartz's (slightly "mongodb"-ified)  DeleteNonExistsJobTest
Merge remote-tracking branch 'hskoro/master'