Identify as "Bitcoin + version number" when mapping UPnP port
Identify as "Bitcoin + version number" when mapping UPnP port

Makes Bitcoin identify itself as "Bitcoin + version number" instead of
the nondescript "libminiupnpc" when forwarding a port via UPnP.

Cannacoin-Project/Cannacoin,reddink/reddcoin,joroob/reddcoin,reddcoin-project/reddcoin,Cannacoin-Project/Cannacoin,coinkeeper/2015-06-22_19-10_cannacoin,ahmedbodi/poscoin,bmp02050/ReddcoinUpdates,joroob/reddcoin,bmp02050/ReddcoinUpdates,reddcoin-project/reddcoin,joroob/reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,reddcoin-project/reddcoin,Cannacoin-Project/Cannacoin,reddcoin-project/reddcoin,ahmedbodi/poscoin,joroob/reddcoin,ahmedbodi/poscoin,coinkeeper/2015-06-22_18-46_reddcoin,reddink/reddcoin,coinkeeper/2015-06-22_18-46_reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,Cannacoin-Project/Cannacoin,reddcoin-project/reddcoin,bmp02050/ReddcoinUpdates,coinkeeper/2015-06-22_19-10_cannacoin,bmp02050/ReddcoinUpdates,reddink/reddcoin,coinkeeper/2015-06-22_18-46_reddcoin,coinkeeper/2015-06-22_18-46_reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,ahmedbodi/poscoin,bmp02050/ReddcoinUpdates,reddink/reddcoin,ahmedbodi/poscoin,Cannacoin-Project/Cannacoin,coinkeeper/2015-06-22_18-46_reddcoin,reddink/reddcoin,joroob/reddcoin,reddcoin-project/reddcoin