Merge remote-tracking branch 'remotes/michalcarson/master' into k0stya-rowspan; see also mleibman#1019 mleibman#1019

Conflicts:
	slick.dataview.js

Author: GerHobbelt

slick.dataview.js

@@ -99,8 +99,11 @@
     var groupingInfoDefaults = {
       getter: null,
       formatter: null,
-      comparer: function (a, b) { 
-        return a.value - b.value; 
+      comparer: function(a, b) { 
+        return (a.value === b.value ? 
+                0 : 
+                (a.value > b.value ? 1 : -1)
+               ); 
       },
       predefinedValues: [],
       aggregators: [],