Use local mysql with ramdisk for unit testing.

We currently use the cloud SQL with a local proxy for testing. More efficient / faster to use a local version of mysql server running with a ramdisk. Need to break out issues:

• [] Create new catalyst-db project and move the DB control scripts from catalyst-core-api here.
• [] Add the idea that a service can be 'ready' or 'not ready' (as well as running and not-running). Perhaps scripts support an 'install' action to go from not-ready to ready (or, they leave it as a manual process).
• [] Add support for installing MySQL on Macs. Probably with Homebrew (issue for catalyst-db repo). See what our options are as-far-as matching versions.
• [] Configure mysql for ramdisk (see this for reference).
• [] Keep the proxy script, but add new 'mysql-local-ramdisk' service (or something).
• [] Update catalyst-persons-api to use the new stuff as a test.

Start by reviewing the DB control scripts in catalyst-core-api and the proxy script, then inspect how catalyst-persons-api uses them for tests. Break the work into the proposed catalyst-db project, service readiness and installation, local MySQL with a ramdisk, and the persons API integration. Done means local ramdisk-backed MySQL can replace cloud SQL for testing.