Support release editor urls

The release editor on current beta.mb.o supports an array of `urls` to be seeded to the release editor. This pull request adds support for this to both the library and all the of included userscripts.

On non-beta mb.o, the scripts will currently give an error, but should otherwise be harmless: ![2014-02-21-225503_675x136_scrot](https://f.cloud.github.com/assets/177659/2235090/29336480-9b43-11e3-90c0-bd19c2c58d60.png) - the release of these updates could also wait for the next server release though (March 3rd), if deemed necessary.

Commit f8097a6 isn't strictly part of this PR's area, but without it, the Bandcamp script is broken.

I haven't tested Encyclopedisque.