Beatport Pro Importer v1

Beatport is working on a new version of their site, currently called Beatport Pro and available at https://pro.beatport.com . The JSON data is still the same, generated from their same API infrastructure, but the way to actually get at the JSON data changed significantly. This userscript runs solely on pro.beatport.com URLs, and will presumably be promoted to the general Beatport importer as soon as it becomes the default interface for everyone.

![screen shot 2014-10-03 at 17 51 10](https://cloud.githubusercontent.com/assets/1882/4513960/6b7ddcc4-4b58-11e4-83a4-8db22096fd14.png)