Building direct.js
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1. Download JSBuilder2 (http://www.extjs.com/products/jsbuilder/)
2. Download Ext source (http://www.extjs.com/products/extjs/download.php)
3. Copy direct.jsb to the Ext source directory
4. cd to the Ext source directory
5. java -jar /path/to/JSBuilder2.jar --projectFile ./direct.jsb2 --homeDir
   /path/to/extdirect/javascript
