Unfinished Levelup move

Level up function is not done as I am not sure how spells will be at the
end.
Added displayText function

This resolves #22 by adding displayText to ultility.js applying us to
draw text on the playerStage from anywhere in the game.
Added Skillshots to game

created a new spell called nidSpear that uses a skillshot that deals
damage to the game. will add exploded fireball next.