Finish loading screen before going fullscreen. Closes MinecraftForge/FML#662

(cherry picked from commit 19d7e16fa6)

Conflicts:
	fml/patches/minecraft/net/minecraft/client/Minecraft.java.patch

fml/patches/minecraft/net/minecraft/client/Minecraft.java.patch

@@ -79,7 +79,7 @@
          this.field_71417_B = new MouseHelper();
          this.func_71361_d("Pre startup");
          GL11.glEnable(GL11.GL_TEXTURE_2D);
-@@ -524,27 +535,35 @@
+@@ -524,30 +535,39 @@
          GL11.glLoadIdentity();
          GL11.glMatrixMode(GL11.GL_MODELVIEW);
          this.func_71361_d("Startup");
@@ -117,14 +117,10 @@
          this.field_152354_ay = null;
          this.field_71461_s = new LoadingScreenRenderer(this);
  
-@@ -553,6 +572,7 @@
-             this.func_71352_k();
-         }
- 
 +        FMLClientHandler.instance().onInitializationComplete();
-         try
+         if (this.field_71474_y.field_74353_u && !this.field_71431_Q)
          {
-             Display.setVSyncEnabled(this.field_71474_y.field_74352_v);
+             this.func_71352_k();
 @@ -970,9 +990,11 @@
  
          if (!this.field_71454_w)