adjust feature selection parameter
use parameter grid instead of flat dict
add more hinge-loss options
better hyperparameters for NB classifiers
correctly print labels for feature-selecting classifiers
optimize parameters for some classifiers
allow for Chi-sq feature selection
add PCA
Merge branch 'dev' into use_normalizer_step
use cosine distance metric for NearestCentroid classifier
remove unused lines, use entire dataset for PCA
add PCA plot
Merge pull request #4 from escherba/dev

add PCA script, adjust parameters of some classifiers