LevelManager added

-able to select level
-unlock a new level if win
-use  key "m" to go back to menu
-use key "v" to win(cheating)
Merge pull request #21 from rtab-IGP-2013/Jiawei

LevelManager added
Merge pull request #22 from rtab-IGP-2013/NEW-Misacorp

Level failed animations, walls and normal maps.
Fixed lose sounds on Level 1 and 2
fixed level2 fix
Updated textures for 1 and 2
added materials to walls
Better Physics Level 1
Fixed physics on level 2 and added super sweet fog
Merge pull request #23 from rtab-IGP-2013/textureupdate

Textureupdate added textures, fixed physics, cool fog.
CameraModel, Exit Signs and holy shit look at Dropbox
Unity save scene before commiting
x toggles cameras backwards
Update README.md
Block crusher is perfect
Block spawner and demoing that with block crusher in physicstestingfacility