add tests to ServiceTest
Merge pull request #9 from gnedov/preMaster

merge preMaster -> Andr brannch
added blank to find events on whole day
!should be uncommented after merge with
Oleg's branch.
added checking for busy person:
isPersonBusyOnTime()
added search Events by person, start + end times
getEventsPersonInvolvedByTime()
JAXB: save event to XML file
CopyPasted from [wasman]'s project
merge to Andr-local from preMaster
small changes after merge
Merge pull request #13 from gnedov/Andr

[Andr] to preMaster
ну, с Богом!...