Sound Cloud: remove songs with a low number of likes

@jagtalon @moollaza @russellholt 
Filters out songs with less than 4 likes. 
Before:
![selection_025](https://cloud.githubusercontent.com/assets/1882892/3008766/2d82c772-decf-11e3-96c6-d9ade03dc84a.png)

After:
![selection_026](https://cloud.githubusercontent.com/assets/1882892/3008767/3416997e-decf-11e3-890d-c1accac278ce.png)