* Remove the 'songtitle' field, 'title' can be used instead.
* Remove newlines in the help text, for consistency with other options.
* Add 'from __future__ import unicode_literals'.
* Call '__init__' from the parent class.
* Add test for the format_to_regex method
This extractor is for Beatport's 2-minute, low-quality track previews
only. To obtain an entire track, you obviously have to purchase and
download it normally through the Beatport store!
Possible future improvements:
- Playlists for albums or other track-list pages
- User login to play from My Beatport, Hold Bin, or Cart