Enemy Sprites and pickup messages

Old simple balls that represented the enemy in the game have been updated for asteroid sprites. So the game has not changed but now we will destroy asteroids instead of that ugly balls, I think it's more fun this way.

When picking a power up, a message at the center of the screen will appear telling us what kind of power up we have picked. This helps to understand what's going on the first time you play the game and also it's a kick way to check what kind of power up we've adquired.

Some minior bugs with the game pause have been also corrected.