Added a limit that takes only a count.

src/main/java/com/samskivert/depot/QueryBuilder.java

@@ -160,6 +160,15 @@ public class QueryBuilder<T extends PersistentRecord>
         return this;
     }
 
+    /**
+     * Configures a {@link Limit} clause configured with the supplied count.
+     */
+    public QueryBuilder<T> limit (int count)
+    {
+        _limit = new Limit(0, count);
+        return this;
+    }
+
     /**
      * Configures a {@link Limit} clause configured with the supplied offset and count.
      */