Put domain names first in site_hosts array

When accessing $_SERVER['SERVER_NAME'] through PHP on Nginx, the first
host in the Nginx conf is used. This makes SERVER_NAME return the
domain name instead of the IP.
Add support for mysql root password
Merge pull request #28 from roots/mysql-passwords

Add support for MySQL root passwords
Add memcached
Merge pull request #29 from roots/memcached

Add memcached
Better development hosts file for Vagrant
Limit some roles to staging and production
Added php5-memcache to php5 setup

Also took the liberty of storing PHP sessions using memcache as well
Merge pull request #35 from FightTheCurrent/master

Added php5-memcache to php5 setup
enable and optimize opcache caching
Merge pull request #44 from FightTheCurrent/feature/opcache

Feature/opcache
Disable Opcache for dev environment
Merge pull request #48 from FightTheCurrent/feature/dev-disable-opcache

Disable Opcache for dev environment
Add fastcgi_param SCRIPT_FILENAME

This could be missing depending on Nginx package versions in Ubuntu so
we're adding it to ensure it's always there.
Always install memcached
Merge tag '0.4.0' into 0.4.0-ssl

Conflicts:
	roles/common/tasks/main.yml
Merge pull request #2 from omoshetech/0.4.0-ssl

Add SSL support to 0.4.0