Minor fixes
Added clustering as a preprocessor, has some flaws
Merge branch 'master' of github.com:ntnu-smartmedia/goldfish

# By Dag Einar Monsen
# Via Dag Einar Monsen
* 'master' of github.com:ntnu-smartmedia/goldfish:
  Add stub code for PreprocessorClassifier

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