[Twisted-Python] Example: Accessing a database from a Resource

As promised in the thread about deferreds and resources, here is an example of making a database call from a resource, using a thread.

I've tried to follow the Twisted development guidelines, so please let me know if I've used any inappropriate naming conventions, etc.

I didn't provide epydoc-style docstrings as I had originally hoped; I haven't had time to read the epydoc manual yet.

Next up will be an example using twisted.enterprise, with Row and without. Hopefully examples of this sort will help newer users in grokking twisted.web, at least until the Woven stuff is ready.

L. Daniel Burr