Add RMSE calculation
Merge branch 'master' of github.com:ntnu-smartmedia/goldfish

# By Patrick Heia Romstad
# Via Patrick Heia Romstad
* 'master' of github.com:ntnu-smartmedia/goldfish:
  Changed how to set pseudorating

Conflicts:
	src/edu/ntnu/idi/goldfish/Preprocessor.java