Updates mysql cookbook to deal with bug for set_unless on chef-solo.
Adds link to Rackspace server provision instructions. Updates recommended chef version to deploy.
Moves mysql role to top of acquia role because php5-mysql package needs mysql first.
Moves nonsecure mysql passwords setting from vagrantfile to role for now.
Creates vagrant user if doesn't exist to avoid chef run failure in phpcs drupal_standard recipe.
Custom drupalcs phpcs recipe now adds a vagrant home dir.