CRM-14353 js function to store initial form values; php to enable warning on add/edit forms;

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* CRM-14353: Fix formNavigate to work with multiple forms & ajax
  https://issues.civicrm.org/jira/browse/CRM-14353
CRM-14353 trigger message when form has unsaved changes;

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* CRM-14353: Fix formNavigate to work with multiple forms & ajax
  https://issues.civicrm.org/jira/browse/CRM-14353
CRM-14353 - remove formNavigate includes, in-progress

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* CRM-14353: Fix formNavigate to work with multiple forms & ajax
  https://issues.civicrm.org/jira/browse/CRM-14353