various model fixes
Database gegenereerd
Merge branch 'Develop' of https://github.com/tomboffe/CemeoCore into Develop

Conflicts:
	CeMeOCore/CeMeOCore/App_Data/aspnet-CeMeOCore-20131211030314.mdf
	CeMeOCore/CeMeOCore/App_Data/aspnet-CeMeOCore-20131211030314_log.ldf
	CeMeOCore/CeMeOCore/Models/Calendar.cs
	CeMeOCore/CeMeOCore/Models/GuestUser.cs
	CeMeOCore/CeMeOCore/Models/Location.cs
	CeMeOCore/CeMeOCore/Models/Meeting.cs
	CeMeOCore/CeMeOCore/Models/MeetingUser.cs