clean up .. of the directory in help info
add two more examples in help
works with 15k features, sparse.crs.crs_matrix
add TFIDFArray to handle toarray(), tolist() issues (still not working for svm_liblinear)
file format for X in fit() and transform() is TFIDFArray; works for svm_liblinear
logging add time; add export_dir option in test_CLI