Fix inhertitance and allow single require

The original inhertitance was naive and it didn't allow for a single
require('extjs-custom') to get the entire library. That is fixed by
letting Ext.js requiring the rest before exporting itself. For class
extending Ext.extend is used.

Ext.js

@@ -211,7 +211,36 @@ var Ext = { //based on 4.2.1.833 only rewritten to fit node
   },  
   log : console.log,
   util: {},
-  dom : {}
-};
+  dom : {},
+
+  /**
+   * Customized version of Ext's define method to extend a Class
+   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create
+   * http://stackoverflow.com/questions/15192722/javascript-extending-class
+   */
+  extend: function(Parent) {
+    //define the new class that extends the parent
+    function F() {
+        // Call the parent constructor
+        Parent.apply(this, arguments);
+    }
+    // inherit parent
+    F.prototype = Object.create(Parent.prototype);//alternative: new Parent();
+
+    // correct the constructor pointer because it points to the parent
+    F.prototype.constructor = F;
+
+    return F;
+  }
+}
+
+Ext.String            = require('./String')(Ext);
+Ext.util.Format       = require('./util/Format')(Ext);
+
+Ext.XTemplateParser   = require('./XTemplateParser')(Ext);
+Ext.XTemplateCompiler = require('./XTemplateCompiler')(Ext);
+
+Ext.Template          = require('./Template')(Ext);
+Ext.XTemplate         = require('./XTemplate')(Ext);
 
 module.exports = Ext;

String.js

@@ -1,4 +1,7 @@
-var Ext = {};
+module.exports = function(Ext) {
+    if (!Ext) {
+        throw(new Error('Dependencies missing'));
+    }
 // @tag foundation,core
 // @require ../version/Version.js
 // @define Ext.String
@@ -9,7 +12,6 @@ var Ext = {};
  * A collection of useful static methods to deal with strings.
  * @singleton
  */
-Ext.String = (function() {
     var trimRegex     = /^[\x09\x0a\x0b\x0c\x0d\x20\xa0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000]+|[\x09\x0a\x0b\x0c\x0d\x20\xa0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000]+$/g,
         escapeRe      = /('|\\)/g,
         formatRe      = /\{(\d+)\}/g,
@@ -35,7 +37,7 @@ Ext.String = (function() {
             return other.length <= s.length; 
         };
 
-    return {
+    var returnObject = {
 
         /**
          * Inserts a substring into a string.
@@ -396,12 +398,13 @@ Ext.String = (function() {
             return words || [];
         }
     };
-}());
 
-// initialize the default encode / decode entities
-Ext.String.resetCharacterEntities();
+    // initialize the default encode / decode entities
+    returnObject.resetCharacterEntities();
+
+    return returnObject;
+};
 
-module.exports = Ext.String;
 /**
  * Old alias to {@link Ext.String#htmlEncode}
  * @deprecated Use {@link Ext.String#htmlEncode} instead