Log Message:
libtorrent-rasterbar: Update to 1.2.7

1.2.7 released

	* add set_alert_fd in python binding, to supersede set_alert_notify
	* fix bug in part files > 2 GiB
	* add function to clear the peer list for a torrent
	* fix resume data functions to save/restore more torrent flags
	* limit number of concurrent HTTP announces
	* fix queue position for force_rechecking a torrent that is not auto-managed
	* improve rate-based choker documentation, and minor tweak
	* undeprecate upnp_ignore_nonrouters (but refering to devices on our subnet)
	* increase default tracker timeout
	* retry failed socks5 server connections
	* allow UPnP lease duration to be changed after device discovery
	* fix IPv6 address change detection on Windows