Create a persistent local space for MySQL data

We're about to create a database for the WSUWP platform to use and the data stored here in development should persist across sessions.
Update .gitignore for the mysql data mapping
Add a custom MySQL configuration to the environment
Explicitly define mysql user and log directories

To better capture logs, we want to make sure that /var/log/mysql exists before starting things up. We can now specify that directory as our general location for mysql logs to appear.
Add a mysqld_safe log specification, not sure why