CRM-12466 - Re-enable CRM_Contact_BAO_GroupContactCacheTest::testManualAddRemove

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* CRM-12466: Group listings don't load
  http://issues.civicrm.org/jira/browse/CRM-12466
Merge pull request #1057 from totten/4.3-groupcontactcachetest

CRM-12466 - Re-enable CRM_Contact_BAO_GroupContactCacheTest::testManualAddRemove