Updating getBBox and anchor code to improve performance

This change will reduce the number of calls to this.container.getBBox
when calculating the bounding box of a node

src/js/parser/javascript/charset.js

@@ -6,12 +6,9 @@ export default {
   definedProperties: {
     _anchor: {
       get: function() {
-        var box = this.container.getBBox(),
-            matrix = this.transform().localMatrix;
+        var matrix = this.transform().localMatrix;
 
         return {
-          ax: box.x,
-          ax2: box.x2,
           ay: matrix.y(0, this.partContainer.getBBox().cy)
         };
       }

src/js/parser/javascript/match_fragment.js

@@ -6,7 +6,7 @@ export default {
   definedProperties: {
     _anchor: {
       get: function() {
-        var anchor = this.content.anchor,
+        var anchor = this.content.getBBox(),
             matrix = this.transform().localMatrix;
 
         return {

src/js/parser/javascript/node.js

@@ -34,23 +34,15 @@ export default class Node {
   }
 
   get anchor() {
-    var box;
-
     if (this.proxy) {
       return this.proxy.anchor;
     } else {
-      box = this.container.getBBox();
-
-      return _.extend({
-        ax: box.x,
-        ax2: box.x2,
-        ay: box.cy
-      }, this._anchor || {});
+      return this._anchor || {};
     }
   }
 
   getBBox() {
-    return _.extend(this.container.getBBox(), this.anchor);
+    return _.extend(util.normalizeBBox(this.container.getBBox()), this.anchor);
   }
 
   transform(matrix) {

src/js/parser/javascript/subexp.js

@@ -6,7 +6,7 @@ export default {
   definedProperties: {
     _anchor: {
       get: function() {
-        var anchor = this.regexp.anchor,
+        var anchor = this.regexp.getBBox(),
             matrix = this.transform().localMatrix;
 
         return {