Fixes issue #832

https://github.com/statsmodels/statsmodels/issues/832

Two changes:
1) Clean up and fix the ipython notebook script.
2) Small cleanup on corresponding example to ensure that they match.
3) Change plot style on rlm example to make a larger plot.
Merge pull request #895 from guyrt/fix-notebook-errors

Doc fixes closes #832  (PR #895, discussion in PR #892 )