BUG: Use two- not one-sided t-test in t_test. Closes #740.
ENH: Import formula.api in statsmodels.api namespace.
Merge pull request #806 from jseabold/formula-api

ENH: Import formula.api in statsmodels.api namespace. Closes #804.
Merge pull request #802 from jseabold/two-sided-ttest

BUG: Use two- not one-sided t-test in t_test. Closes #740.
ENH: Add files to convert inputless ipynb->rst
DOC: Add notebook files from tutorial
DOC: Update Makefile to build ipynb files
DOC: Add CSS modified from nbviewer.
DOC: Skip notebook files in restify examples.
DOC: Make sure to hash the right filename
DOC: Update titles
DOC: Add notebook examples to docs
DOC: Handle title separately for sphinx
DOC: Do not run nbgenerate if paths need updating.
ENH: Make sure code is robust to IPython versions
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