Race condition loading shapes (#749)

* Make the draw.render event fire after cleanup

This means that the draw control is in its final state when the event is fired
so that it is safe for anything responding to the event to make changes to
the draw instance

* mark the store as dirty to properly render the first time.

src/render.js

@@ -79,8 +79,8 @@ module.exports = function render() {
     });
   }
 
-  store.ctx.map.fire(Constants.events.RENDER, {});
   cleanup();
+  store.ctx.map.fire(Constants.events.RENDER, {});
 
   function cleanup() {
     store.isDirty = false;

src/setup.js

@@ -85,6 +85,7 @@ module.exports = function(ctx) {
         ctx.map.addLayer(style);
       });
 
+      ctx.store.setDirty(true);
       ctx.store.render();
     },
     // Check for layers and sources before attempting to remove