add docs/libtorrent_plugins.{rst,html} to makefile build system
add docs/libtorrent_plugins.{rst,html} to makefile build system

snowyu/libtorrent,TeoTwawki/libtorrent,hamedramzi/libtorrent,snowyu/libtorrent,TeoTwawki/libtorrent,TeoTwawki/libtorrent,hamedramzi/libtorrent,hamedramzi/libtorrent,snowyu/libtorrent,hamedramzi/libtorrent,TeoTwawki/libtorrent,hamedramzi/libtorrent,TeoTwawki/libtorrent,hamedramzi/libtorrent,snowyu/libtorrent,TeoTwawki/libtorrent,snowyu/libtorrent,snowyu/libtorrent