minibar: adding a start category menu

+ The start category menu can be turned off by passing the option
  {startcat_menu:false} when starting the minibar.
+ Documentation updates.

src/www/minibar/gf-web-api-examples.html

@@ -90,6 +90,7 @@ full API.
   <dt>http://localhost:41296/grammars/Foods.pgf
   <dd>{"name":"Foods",
  "userLanguage":"FoodsEng",
+ "startcat":"Comment",
  "categories":["Comment","Float","Int","Item","Kind","Quality","String"],
  "functions":["Boring","Cheese","Delicious","Expensive","Fish","Fresh",
            "Italian","Mod","Pizza","Pred","That","These","This","Those","Very",
@@ -145,7 +146,7 @@ full API.
 </dl>
 <hr>
 <div class=modtime><small>
-<!-- hhmts start --> Last modified: Sun Aug 21 10:52:43 CEST 2011 <!-- hhmts end -->
+<!-- hhmts start --> Last modified: Tue Oct 18 16:36:36 CEST 2011 <!-- hhmts end -->
   </small></div>
 <address><a href="http://www.cse.chalmers.se/~hallgren/">TH</a></address>