Classes clean-up

ToDo:

• remove vivo:FundingOrganization
• mwo:WebService [new def]
• mwo:Repository [new def] A central location in which data is stored and managed.
• mwo:Database [new def] A structured collection of data which is stored and accessed electronically.
• mwo:SemanticResource [new def]
• mwo:EducationalEvent [new def]