MOBSDK-758: The SDK does not correctly handle "Invalid access token" errors
MOBSDK-759: Protect removeObjectAtIndex call in AlfrescoLegacyAPIDocumentFolderService
MOBSDK-760: Protect insertObject:atIndex: in AlfrescoPublicAPISiteService
Merge pull request #297 from mikeh/master

MOBSDK-758. MOBSDK-759. MOBSDK-760