Added a GreenLaser prefab.
Added a FireLaserScript and an EnemyAI Controller Script to the Enemy Prefab.  The Enemy now moves to the left and shoots lasers at a cool down rate of 1 second.
Fixed a bug whereby the position of the laser was always offset to the right of the Prefab shooting it, which makes it look weird in the case of the Enemy prefab.
The enemy now shoots correctly!