Calendar interaction with the events:
	changed view ->event->index.gsp Ajax call on select
	changed EventController -> added function findEventsByDate
Music and Sport Categories interact with the events
	changed view ->event->index.gsp Ajax call on click
	changed EventController -> added function findEventsByCategories
Calendar interact also with the selected category
	changed EventController -> changed function findEventsByDate
	changed EventController -> added static variable to store category
Added some boostrap test data with event belonging to EventCategory
Uncommented the relation of Events and EventCategory