Tidy up:

1) Comments
2) Facebook exception handling (would of been useful yesterday)
3) Addition of Facebook.getAppFriends to javascript API (more useful than existing all friends method)
4) Fixes to Document Library sample

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@7262 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/scripts/facebook/FacebookAPIServlet.java

@@ -49,9 +49,7 @@ public class FacebookAPIServlet extends WebScriptServlet
     private static final Log logger = LogFactory.getLog(FacebookAPIServlet.class);
 
 
-    /*
-     * (non-Javadoc)
-     * 
+    /* (non-Javadoc)
      * @see javax.servlet.http.HttpServlet#service(javax.servlet.http.HttpServletRequest,
      *      javax.servlet.http.HttpServletResponse)
      */
@@ -63,9 +61,9 @@ public class FacebookAPIServlet extends WebScriptServlet
         WebScriptRuntime runtime = new FacebookAPIRuntime(registry, serviceRegistry, authenticator, req, res, serverConfig);
         runtime.executeScript();
     }
-    
-    /**
-     * @return  default authenticator (bean name)
+
+    /* (non-Javadoc)
+     * @see org.alfresco.web.scripts.WebScriptServlet#getDefaultAuthenticator()
      */
     @Override
     protected String getDefaultAuthenticator()