CRM-12911 - CRM.Backbone.sync - Add mechanism for API-assisted duplication of entities

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* CRM-12911: Implement "Duplicate" feature for Jobs
  http://issues.civicrm.org/jira/browse/CRM-12911
Merge pull request #1324 from totten/master-duplicate

CRM-12911 - CRM.Backbone.sync - Add mechanism for API-assisted duplicati...