Fix #1604, Checkbox toggles on spacebar

src/definitions/modules/checkbox.js

@@ -137,6 +137,7 @@ $.fn.checkbox = function(parameters) {
               key     = event.which,
               keyCode = {
                 enter  : 13,
+                space  : 32,
                 escape : 27
               }
             ;
@@ -146,7 +147,7 @@ $.fn.checkbox = function(parameters) {
                 .blur()
               ;
             }
-            if(!event.ctrlKey && key == keyCode.enter) {
+            if(!event.ctrlKey && (key == keyCode.enter || key == keyCode.space)) {
               module.verbose('Enter key pressed, toggling checkbox');
               module.toggle.call(this);
               event.preventDefault();