Two small changes needed if uTorrent is on another machine

Firstly, sorry for the garbage diff on the appxmanifest, there is only really one change - added the privateNetworkClientServer capability. This is needed in order to get intranet access.

The other change corrects the retrieval of the last host you connected to. The default 127 address is OK if you're running uTorrent on the same box as uTorrentMetro, but not so good if it is on another machine :-)