CRM-14186: drush cache clear: use the API to flush the code, and slip in a fix to delete the civicrm_class_loader drupal variable that can cause problems if the civicrm instance is moved around on a same server and classloader could get included twice.
merge
Use civicrm_api() instead of civicrm_api3()

since checking for is_error.
Merge pull request #118 from mlutfy/4.4-crm14186

CRM-14186: drush cache clear: use the API to flush the code, and slip…