Initial commit

Plugin for aria2, the "ultra fast download utility".

Requires [aria2c](http://aria2.sourceforge.net) be installed and running in [daemon mode](http://aria2.sourceforge.net/manual/en/html/aria2c.html#cmdoption-D) with [XML-RPC](http://aria2.sourceforge.net/manual/en/html/aria2c.html#rpc-interface) enabled (both set in aria2 config file).