Modifyed class Event GregorianCalendar was changed to DateTime (joda) and joda-time-2.3.jar vas added to the lib folder
Merge branch 'preMaster' into Oleg
Added functions addEvent, removeEvent and MultiMap store
Pre version of EventStorage is done
Only changed CalendarService on DateTime in all files. All tests are works good now
Changed interfaces: added EventStore interface and renamed ICalendarService to CalendarServiceImpl
Fixed some bugs