[libtorrent] libtorrent 1.1.4 released

[Arvid Norberg]

It's up on github:
https://github.com/arvidn/libtorrent/releases/tag/libtorrent-1_1_4

This is the latest release from the current stable branch. Changes since
1.1.3:

1.1.4 release

* corrected missing const qualifiers on bdecode_node
* fix changing queue position of paused torrents (1.1.3 regression)
* fix re-check issue after move_storage
* handle invalid arguments to set_piece_deadline()
* move_storage did not work for torrents without metadata
* improve shutdown time by only announcing to trackers whose IP we know
* fix python3 portability issue in python binding
* delay 5 seconds before reconnecting socks5 proxy for UDP ASSOCIATE
* fix NAT-PMP crash when removing a mapping at the wrong time
* improve path sanitization (filter unicode text direction characters)
* deprecate partial_piece_info::piece_state
* bind upnp requests to correct local address
* save resume data when removing web seeds
* fix proxying of https connections
* fix race condition in disk I/O storage class
* fix http connection timeout on multi-homed hosts
* removed depdendency on boost::uintptr_t for better compatibility
* fix memory leak in the disk cache
* fix double free in disk cache
* forward declaring libtorrent types is discouraged. a new fwd.hpp
header is provided