CRM-14389 - CiviMember API - Fixes a membership get API regression that caused membership type to be ignored

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* CRM-14389:
  http://issues.civicrm.org/jira/browse/CRM-14389
Merge pull request #2805 from rnao/CRM-14389

CRM-14389 - CiviMember API - Fixes a membership get API regression that ...