Fix building by ensuring the SWIG files are proper, for Windows espcially
libtorrent: add libtorrent/export.h
Properly handle the intrusive_ptr for libtorrent::torrent_handle::torrent_file()
Fix pkg-config and update to libtorrent 1.0.2, openssl 1.0.1i, boost 1.56
Add Dockerfile for windows-x86