worked on CRM-13233
clean up
CRM-13233, js and formRule fixes

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* CRM-13233: Payment Method field (payment_processor) should not be required if total fee is $0
  http://issues.civicrm.org/jira/browse/CRM-13233
more cleanup CRM-13233

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* CRM-13233: Payment Method field (payment_processor) should not be required if total fee is $0
  http://issues.civicrm.org/jira/browse/CRM-13233
Merge pull request #1497 from kurund/CRM-13233

CRM-13233, js and form rule fixes if zero amount is selected for events