CRM-13397 - Contribte - Add submitOnce behavior to contribute button when confirmation page is disabled

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* CRM-13397: Protection against multiple submits on contributions page doesn't work when confirmation page is turned off
  http://issues.civicrm.org/jira/browse/CRM-13397
CRM-13634 - WP - Workaround for contribution page js bug

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* CRM-13634: Non-frontend CRM pages in WP cannot modify html-header
  http://issues.civicrm.org/jira/browse/CRM-13634
Merge pull request #1841 from colemanw/4.4

CRM-13397 - Contribte - Add submitOnce behavior to contribute button when confirmation page is disabled