Adds two doors to valley-tacotown and valley-2

This adds two entrances to the taco town so if you enter on top of the building you stay up top
![tacotown](https://f.cloud.github.com/assets/2179547/1434715/3589ee16-4125-11e3-8bbf-87be2ef596ba.png)

I also adjusted the platforms so their uniform with the ones in town and removed the note node that teaches the player to dig since that point is no longer the first time the player will see breakable blocks.

edit: I also placed a bone on top of the building to entice the player to explore