PR #6: Test all modern Debian-based OSes for better version compatibi…

…lity.

Fix broken behavior under Ansible 2.7 due to yum module change.

Update syntax and style.

Fixes #4: Update defaults to assume PHP 7.0.

Remove Ubuntu 12.04 Docker test.

Fixes for #3.

Fix bug in previous commit.

Fixes #2: Make php_mysql_package configurable.

Add EL 7 to supported platforms.

Use default MySQL innodb log file size to make Travis happy.