EST-38: break options and events now shown in calendar...

... dependent on https://github.com/danhaywood/isis-wicket-fullcalendar2

In addition,
* added new FixtureScript to setup example break options
* updated EstatioAppDashboard to show current events
EST-38: rebased, fixed checkstyle issues...

also:
* depending on fullcalendar2 (in Maven central repo)
* added LeaseTypes to isis.properties