removed mariadb specific references, default shell back to 'SQL',

getting ready to add MySQL 5.7, Percona 5.6 and MariaDB 10 Galera
support.

Adding several more sensible config examples, also something more laptop
friendly.

To come are configs for mysql 5.6+5.7 and mariadb 10 replication
settings, and default galera config example.
removed vim swap files and added a few more innodb settings.
deprecated tutorial, and galera commands. Moving galera to be config
template.