[firedrive] Add new extractor. Addresses #3095

Hi,
this adds an `InfoExtractor` for [firedrive.com](https://www.firedrive.com/), also addressing issue #3095.

The test video is a FLV transcode of [Big Buck Bunny](http://www.bigbuckbunny.org/), which is [licensed](http://www.bigbuckbunny.org/index.php/about/) under [Creative Commons Attribution 3.0](http://creativecommons.org/licenses/by/3.0/).