Updated to reference class reference generated using [appledoc](http://gentlebytes.com/appledoc/).
Modified to use renamed protocol `DownloadManagerDelegate` (previously called `DownloadManagerDelegateProtocol`)
Renamed protocol `DownloadDelegate`
Added comments for appledoc; renamed protocol `DownloadManagerDelegate` (previously `DownloadManagerDelegateProtocol`)
Renamed `DownloadManagerDelegate` protocol (formerly `DownloadManagerDelegateProtocol`)
Added documentation generated by appledoc
Added comments for appledoc; renamed `DownloadManagerDelegate` protocol (former `DownloadManagerDelegateProtocol` )
Project settings update for Documentation