Finished unit tests for feature selection
changed names to experiments which are only meant for testing to indicate this; removed debug files produced by tests
cleaned up a unit test a little bit
resumed work on tests for composers and fixed a bug with the __contains__ method of Additive/Multiplicative
updated sample thesauri so that they are built with the cosine measure, which is what is used internally by the classication framework for on-the-fly classification
Minor fixes to CompositeVectorSource (order of neighbour and similarity score was inverted) and PrecomputedSimilaritiesVectorSource (lookup works with n-gram features, if they are in the underlying thesaurus)