Code cleanup
Renamed „downloadPaused“ to „suspended“ to use homonym naming with NSOperationQueue, refactored this property to just forward the suspended state of the download queue
Removed „downloadPermission“ as it coincided with the negation of property „isInOfflineMode“. Renamed „isInOfflineMode“ to „offlineMode“.
Refactored property „concurrentOperations“ to assign/read value from operation queue
Code cleanup