add file count
add metadata display

* Convert currentplayer to an object with the following attributes
	- url: current url
	- output:
		- out: array of stdout lines
		- err: array of stderr lines
* Add metadata table to index page

Ideally, we'd figure out which metadata is actually useful, and display them
prettily.

For example, ``ID_LENGTH`` shows how long the video is, and ``ID_VIDEO_HEIGHT``
tells you the quality (ish). There's also metadata telling us what subtitle
tracks there are. However, most of it is useless (we don't need to know what
codecs we're using).