Zodburi support

Hello

Here is the support for postgres:// uri for zodburi that previously was in zodburi. It requires zodburi 1.1 that was released earlier today, otherwise the conflict of entry points might produce a black hole (or just plain not work).

There are tests, and I just made it work on heroku, so everything should be okay.

I also added a gitignore, and rename the readme so that it is nicely displayed on github, if that's okay for you.