First try at the documentation
Add a dotcloud.yml to publish the docs on dotCloud

The docs will be reachable on sandbox.dotcloud.com.

I think this is just simpler than gh-pages or read the docs:

- easier to map the domain to it since *.dotcloud.com already points to
  the dotcloud platform;
- doesn't leave generated files in git;
- and I'm not even sure if we can use read the docs, since we need to
  have the package installed to use Sphinx autodocs.
Link the README to the docs at http://sandbox.dotcloud.com/