Fixed some problems

So last time you could double jump, and i somehow fixed that so now it workes.

I also improved the "goal" of each level(The gem), so now it workes a bit better not perfect, so if it dosent take you to the next level, jump/walk into it agin.

And the "QUIT" button still does nothing, the reason for that is because I originaly desigened it for PC/Windows, but then changed to HTML5, so not the "QUIT" button still crashes the game, so dont use that thx.