Updated rtorrent library - scgi fix for Python 2.6
Updated rTorrent library and fixed call to MethodError.message (should be MethodError.msg) in _update_provider_group
Updated rTorrent library - MethodError exceptions when calling group methods should be fixed.
Merge pull request #2331 from fuzeman/feature/dev_rtorrent

rTorrent Downloader - fixes to scgi on Python 2.6
Merge branch 'develop' into develop_torrent_files