* Pass datepicker arguments through filter before sending to ninja-forms-admin.js
* Actually pass safe datepicker_args array to ninja-forms-admin.js
* Pass filtered datepicker_args array to subs-cpt.js
* Use unique filter name for datepicker arguments on forms admin page
* Pass filtered datepicker_args to ninja-forms-display.js
* Prefix all new filters for datepicker_args
Merge pull request #384 from NateWr/develop

Pass datepicker arguments through a filter and fix error with empty dateFormat