MultiIndex methods not listed in API reference
It would be really useful to have the documentation for the methods specific to `MultiIndex` such as `.from_product()` and `.from_tuples()` to be listed with links in the API reference (http://pandas.pydata.org/pandas-docs/stable/api.html). 

I'm willing to edit the api.rst file, but when I build the docs from scratch (using `python make.py html`), the resulting api.html file is incomplete.  Before I make changes, I'd like to make sure the build of the docs works right.  Maybe the build issue should be a different issue?
