CRM-13388 - Fix upgrade error due to undefined column, "description"

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* CRM-13388: Drush upgrade fails due to missing column, civicrm_uf_group.description
  http://issues.civicrm.org/jira/browse/CRM-13388
Merge pull request #58 from totten/7.x-master-ufgroup-upgrade-error

CRM-13388 - Fix upgrade error due to undefined column, "description"