Version 0.0.8

-> Added ScoreBoard and LifeCounter classes
-> Positioned score and life counter on screen
-> Added random enemy class. The AI will spawn the enemy randomly from
the right side of the screen.
-> Added stage one setup function
-> Added linear enemy class. Same as random except it spawns at the same
y axis as the player's ship y position.
-> Added collision detection with player and random enemy
-> Added collision sound effects for bullet and ship
-> Updated score for collisions
-> Added explosion class
-> Explosion class works from spritesheet for now...