MOBSDK-482 (Part I)

MOBSDK-482
* contains a bug fix in AlfrescoCMISObjectConverter - to ensure that custom type properties are correctly converted
* reinstated unit tests to test creation/update of custom types
* some refactoring in AlfrescoDocumentFolderService to handle property/type/aspect processing


STILL TO BE DONE:
* cm:content/cm:folder -> MOBSDK-509. 
* AlfrescoContent superclass to contentFile/contentStream
(* MOBSDK-381 -> not sure this is relevant any more?)