title: ckeditor 4.3.3 enable file browser/uploader
body: <p>I am making a cms and I am using ckeditor as the wysiwyg editor.now i would like to enable upload of images from the local file system,but i am stucked!<br />
  I google this problem and find many answers about this!but the answers seem not solve my problem.I do some work try to enable the file browser as follows,but it can't work:</p>
  
  <pre><code>1.I download the ckeditor "Standard Package".
  2.I add ckeditor to my page as the official doc says and it work well.
  3.I download the add-ons "File Browser" and "Popup" from the add-ons part of ckeditor.com.
  4.I set the config in "ckeditor/config.js",
    config.extraPlugins = 'popup,filebrowser';
  </code></pre>
  
  <p>I do all of these,but it still can not display the "file browser" button,can anyone tell me where I am wrong and if I need to do some extra work and config?<br />
  also,I am using ckeditor with php!</p>