Added badguys

They currently just move to the arrow keys along with the player, which is
pretty interesting! But not right
Badguys stay still
Changed map to workaround melonjs collision bug

https://github.com/melonjs/melonJS/issues/50
Show face when collide with enemy
Bullet appears on space

Albeit in the wrong place and direction

Also disappears when it hits a wall - phew!