Move GLRenderStage enum to its own file.

src/Render.ts

@@ -1,8 +1,8 @@
 export {DOMRenderer, IVNodeHash} from "./render/DOMRenderer";
 export {
     GlRenderer,
-    GLRenderStage,
     IGLRenderFunction,
     IGLRender,
     IGLRenderHash,
 } from "./render/GlRenderer";
+export {GLRenderStage} from "./render/GLRenderStage";

src/render/GLRenderStage.ts

@@ -0,0 +1,6 @@
+export enum GLRenderStage {
+    BACKGROUND,
+    FOREGROUND
+}
+
+export default GLRenderStage;

src/render/GlRenderer.ts

@@ -4,14 +4,10 @@
 import * as rx from "rx";
 import * as THREE from "three";
 
+import {GLRenderStage} from "../Render";
 import {IFrame} from "../State";
 import {Camera} from "../Geo";
 
-export enum GLRenderStage {
-    BACKGROUND,
-    FOREGROUND
-}
-
 export interface IGLRenderFunction extends Function {
     (
         alpha: number,