Fixed an crash in the MBResourceService
Github Ticket: https://github.com/ItudeMobile/itude-mobile-ios-mobbl-framework/issues/14
Jira Ticket: https://mobiledev.itude.com/jira/browse/MOBBL-1080
Merge pull request #15 from FrankVanEenbergen/develop

Fixed a crash in the MBResourceService due to memory management