-- CRM-13325 added attribute to "link" custom field

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* CRM-13325: Custom field HTML should indicate group+field name
  http://issues.civicrm.org/jira/browse/CRM-13325
Merge pull request #1602 from ravishnair/CRM-13325

-- CRM-13325 added 'data-crm-custom' attribute to "link" custom field