Latest changes from ObjectiveCMIS lib clean up

a.) merged updated ObjectiveCMIS lib with AlfrescoSDK. Cleanup includes method parameter renaming and enabling network request cancelling on all service calls
b.) removed ISO8601 parser and use the one provided in the CMISLib instead

NOTE: there is one unit test failing: 
testRetrieveDocumentsInFolderWithIncorrectSortProperty
It fails on asserting the sorted array order. This is currently being investigated