Stateless ncwms get filters as json

 * Stateless `getFiltersAsJSON controller for ncwms
 * Stateless `getStylesAsJSON controller for ncwms
 * Client parsing is now much dumber
 * Date assembly is done in server side (grails)

This API is still work in progress, but enables us to see where we actually want to get to.
@danfruehauf trivial review comments done. 
I have a concern with the implementation. When the user picks a day where the time need to be retrieved the date picker closes immediately after the user selects the date.
When the date has been picked before there is a lag where nothing happens immediately. I'm using Firefox