CRM-14700 - revert to addSelect() now that MembershipType.xml has valid ref to get the options.

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* CRM-14700:
  https://issues.civicrm.org/jira/browse/CRM-14700
Merge pull request #3283 from davecivicrm/CRM-14700a

CRM-14700 - revert to addSelect() now that MembershipType.xml has valid ...