Merge pull request #11 from escherba/m_charts

factor out charting subsystem into chart folder
Merge pull request #12 from escherba/m_refactor

move library modules to utils
Merge pull request #13 from escherba/m_refactor

PCA pipeline improvements, use special folder for intermediates
Merge pull request #14 from escherba/m_preprocess

correct content preprocessing
Merge pull request #15 from escherba/m_preprocess

pretty ROC charts
Merge pull request #16 from escherba/m_preprocess

makefile fix (2)
Merge pull request #17 from escherba/m_preprocess

Make fixes
Merge pull request #18 from escherba/m_preprocess

fix HTML entity problem in preprocessing step
Merge pull request #19 from escherba/m_preprocess

make this work with 20 newsgroups, generate word clouds
Merge pull request #20 from escherba/m_preprocess

make wordpuncttokenizer default instead of treebank
Merge pull request #21 from escherba/n_fp_growth

add frequent pattern search
Merge pull request #22 from escherba/n_fp_growth

make-ify freq patterns
remove whitespace
merge master