lomax: Implement third-party MySQL library support for OR mapping.

[simar7]

We can re-use a lot of common mysql code between different forks/flavors of mysql by refactoring this out to a separate library.

[simar7]

I've found a bunch of libraries we can use to enhance connection handling with the mysql server. We should look into integrating these into lomax.

1. gorp: https://github.com/go-gorp/gorp
2. dbr: https://github.com/gocraft/dbr
3. sqlx: https://github.com/jmoiron/sqlx

[simar7]

This is low pri for now and is also a low hanging fruit in case someone wants to get involved with the lomax project.