Add normalized functionality

src/core.js

@@ -394,9 +394,10 @@ c3_chart_internal_fn.updateSizes = function () {
     }
 };
 
-c3_chart_internal_fn.updateTargets = function (targets) {
+c3_chart_internal_fn.updateTargets = function (t){
     var $$ = this;
 
+    var targets = $$.normalize(t);
     /*-- Main --*/
 
     //-- Text --//
@@ -496,8 +497,6 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
         $$.y2Axis.tickValues($$.generateTickValues($$.y2.domain(), config.axis_y2_tick_count));
     }
 
-    $$.normalize();
-
     // axes
     $$.redrawAxis(transitions, hideAxis);
 

src/stacked.js

-c3.chart.internal.fn.normalize = function(){
-    var $$ = this, tr = [], c = [],
-        data = $$.api.data();
+c3.chart.internal.fn.normalize = function(targets){
+    var $$ = this, tr = [], c = [];
 
-    if(!$$.config.normalized){
-        return;
+    if(!$$.config.normalized || isUndefined(targets)){
+        return targets;
     }
 
-    for(var k = 0; k < data[0].values.length; k++) {
+    var data = copyArray(targets);
+
+    for(var k = 0; k < targets[0].values.length; k++) {
         var tt = 0;
-        for(c in data) {
-            tt = tt + data[c].values[k].value;
+        for(c in targets) {
+            tt = tt + targets[c].values[k].value;
         }
         tr[k] = tt;
     }
 
-    for(c in data) {
+    for(c in targets) {
         for(k = 0; k < tr.length; k++) {
-            data[c].values[k].value = data[c].values[k].value / tr[k];
+            data[c].values[k].value = targets[c].values[k].value / tr[k];
         }
     }
+
+    return data;
 }

src/util.js

@@ -63,9 +63,17 @@ var isValue = c3_chart_internal_fn.isValue = function (v) {
         var newObj = {};
         for(var key in oldObj){
             if(oldObj.hasOwnProperty(key)){
+                if(typeof oldObj[key] === 'object'){
+                    newObj[key] = copyObject(oldObj[key]);
+                } else if(Array.isArray(oldObj[key])){
+                    newObj[key] = copyArray(oldObj[key]);
+                } else if(typeof oldObj[key] === 'function'){
+                    newObj[key] = oldObj[key].bind(newObj);
+                } else {
                     newObj[key] = oldObj[key];
                 }
             }
+        }
         return newObj;
     },
     copyArray = function(oldArray){