Added extra Exception to catch
Updated $servers property default value to empty array.
Added ServerSetMapper
The mapper can be DI'd around to construct a valid ServerSet based on database Server entities whenever required
Mapped Download to Client|User
Updated User ctor phpdoc
One Client can have many Downloads
Added DownloadToTorrentMapper
This maps an array of Download objects to an array of Torrent objects via the TorrentPHP library
 Added ActiveDownloadsStatistic, ClientTransportDecorator
 ActiveDownloadsStatistic aggregates various services to provide the number of active downloads for the dashboard
 The ClientTransportDecorator extends Transmission's ClientTransport from TorrentPHP lib to provide extra functionality (for torrent count, at first)