CRM-15331 Backport for drush civicrm-install: check for the civicrm.settings.template file.
Merge pull request #164 from mlutfy/6.x-4.5-crm15331

CRM-15331 [6.x-4.5] Backport for drush civicrm-install: check for the civicrm.settings.template file.