Added LaserEmitter prefab.

I believe we are ignoring the Scene setup files so you have to add the
laser emitter for this to work in your own scene. This is how you do it:
- In the prefab folder there is a prefab called ”laserEmitter”, add
this to the ARCamera as a child object. Add two of these for coolness.
- All the transform variables should be set to 0 for the laserEmitter.
- Set the Position X a little bit to the left ( < 0.0) for 1 of the
laserEmitters then the other should be set to a position x a little bit
to the right (> 0.0). I used -0.2 and 0.2.

- Run the program