rTorrent: added tunned rtorrent.rc for RPi, lower memory usage.
rTorrent: fixed series sort function and added on/off option for it. added rutorrent label sort.
ruTorrent: added plugin lbll-suite, good at handling labels.
rTorrent: bump version to 3.1.9
Updated README.md and added CONTRIBUTING.md
Merge pull request #6 from jenkins101/contribu

Contributing: added initial Contributing page, needs more work.
Merge pull request #5 from jenkins101/3.1.9

rTorrent: Version 3.1.9