Increased maximum memory to 1024

Increased maximum memory for future proofing purposes.
Allow mariadb to startup on boot

Added the 'enabled' option to mariadb to allow it to startup on boot.
This allows the database to be ready after every restart.
Merge pull request #79 from ausaccessfed/feature/mariadb-enabled

Added mariadb startup on boot
resolves #76
resolves #82