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 http://sandbox.dotcloud.com/