Exposed user-defined cmis:objectType(SubType) in the Server and Solr

- Defined in base_model.yml.
- UI(NemakiShare) is not ready for handling with subtypes, like showing the property specific to the subtype. So for test you should set objectType value directly in CouchDb.
Merge pull request #13 from NemakiWare/subTypeProperty

Exposed user-defined cmis:objectType(SubType) in the Server and Solr