MOBSDK-646: Add helper properties to AlfrescoActivityEntry class to aid decoding
MOBSDK-704: Parallel content downloads can overwrite each others local files
Turn down the verbosity on some rendition-based logging
Unit Test fixes: Order of types in objectTypeId is no longer determinable. Compiler warnings for NSInteger to string conversion.
MOBSDK-646: Renamed internal methods to reflect naming changes elsewhere. Fixed property overwriting issue.
MOBSDK-704: Follow-up fix to temp file name generator. Moved internal NodeRef prefix constant around.
Merge pull request #266 from mikeh/master

MOBSDK-646, MOBSDK-704, unit test fixes