MHCflurry documentation

Due to our use of sphinxcontrib-autorun2 we unfortunately require Python 2.7 to build to the docs. Python 3 is not supported.

To generate Sphinx documentation, from this directory run:

$ pip install -r requirements.txt  # for the first time you generate docs
$ make generate html

Documentation is written to the _build/ directory. These files should not be checked into the repo.