Nightingale compatibility

[freaktechnik]

It would be nice to support http://getnightingale.com!

[AntoineTurmel]

I guess it's up to us to port it, since it's from a POTI employee.

[AntoineTurmel]

http://nzf.turmel.info/ngale/soundcloud-1.0.3+dev-201303280131.xpi should work, will do a pull request later.