ENH: Raise exceptions properly
DOC: Add cleancache and cleanall to Makefile
DOC: Fix headings/titles for sphinx
DOC: Update to get_margeff
DOC: Update title
DOC: Some cleanup and corrections
DOC: Cleanup plotting
DOC: Use latex for math
DOC: Code cleanup. Use sm.NegativeBinomial.
DOC: Cleanup plots. Use library functions
DOC: Cleanup code and plots. Add section on formula prediction
DOC: Use get_rdatasets. Fix one plot.
DOC: Use library function. Cleanup plotting.
DOC: Remove TODO add link to github issue
DOC: Code/plot cleanup.
REF: Move notebooks
REF: Rename back. No conflict.
REF: Move more notebooks