Migrate/mongo mariadb

Triple check config, and migrate settings (new models must have `migrate: 'alter'` first time)

So:
* Check alter settings
* Install mariadb
* Create database `fortress`
* Check mariadb config (bind port etc)
* When completely done, remove mongo
* When completely done, remove *old models

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sudo apt-get install software-properties-common
sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db
sudo add-apt-repository 'deb http://ams2.mirrors.digitalocean.com/mariadb/repo/10.0/ubuntu trusty main'