Make RDBMS-based persistence easier to set up

[notjuanortiz]

Problem

To get the SQLSerializer to work, I've had to manually create a few tables on my database.

Solution

It would be nice to have a schema that I could just import to get things running quickly.

[notjuanortiz]

Atm there is no database specified during the connection initialization. Now I'm wondering if it's best to loosely support all databases (or at least the most common ones) or just one and optimize for it.