In the item.java u add an extra 's' at the method name:
public String getTextureFiles()
{
return CommonProxy.ITEMS_PNG;
}
Try:
public String getTextureFile()
{
return CommonProxy.ITEMS_PNG;
}
Also you didn't call the right image files in the commonProxy.java. I'm sure this will fix the "texture not loading" problem... at least for forge 6.3.0 (mc 1.4.4).