Basic DHT support
Move DHT loading to where it belongs
Merge branch 'master' into wip/dht
Deprecation.

The torrent class is now derived from torrent_handle, deprecating most get/set accessors.
De-deprecated core
Better alert handling
Merge branch 'wip/peer' into wip/dht
Fix stack overflow when pausing a torrent
Add UPnP, NAT-PMP and LSD
Cleanup unused things
Merge master in wip/dht
Remove annoying alert message and inhibit notifications about finished torrents on startup
Re-enabled default extensions
Add identification of other gTorrent peers
Fix build.

>2014
>const correctness
Merge master into wip/dht
Remove deprecated call
Merge pull request #117 from gtorrent/wip/dht

DHT, UPnP, NAT-PMP and LSD support.