Improve "la tienda" scene

[spassvogel]

The scene can be improved

• Create model for front wall (with door and window)
• Add more products and other items to the store
• Camera colour filters to create a more unified look
• Add skybox (can be seen through the window)
• Create some sort of exterior view which can be seen through the window
• Retexture the US flag to a Mexican one
• Make more interesting lighting

[spassvogel]

I've added a bunch more stuff to the scene, see 6427c98