Asgard-1165 - Better double form submission prevention

Correctly handles both the cases of regular form and jQuery validate form
Better spinner image for light grey backgrounds
Make submit buttons look unclickable
Use toggleClass instead of if-else
Better variable name
Merge pull request #326 from joesondow/ASGARD-1165-better-double-submit-prevention

Asgard-1165 Better double submit prevention