CRM-15154 - Shift 'CiviCRM' link

(per discussion in https://github.com/civicrm/civicrm-wordpress/pull/51)
CRM-15154 - Allow filter "civicrm_menu_item_position"
Merge pull request #53 from totten/4.5-civicrm-weight-2

CRM-15154 - Shift 'CiviCRM' link