Merge pull request #91 from austinpray/master

Changes MariaDB mirror to digital ocean
Merge pull request #92 from austinpray/master

Use server-configs-nginx 1.0.0
Add variable for MariaDB dist

No specific dist release of MariaDB exists for Ubuntu 14.10 Utopic yet
so we'll introduce a variable set to Trusty by default for now.
Merge pull request #94 from roots/mariadb-source-use-trusty

Add variable for MariaDB dist