Updated POST version(only) to use java 9, the original still only works with java 8

I ended up having less time than I thought so ended up not having enough time for my original idea. I has about three hours left when i thought "isn't snake technically running out of space?" so here we are.

The playing area shrinks over time starting fast and then slowing down as it expands.If you enter the red area you will get teleported to the other side like normal. there is no penalty to being in the red area. You move with WASD or arrow key and can speed up with shift or slow down with ctrl.

Added a post download link that is a single jar so you don't have to extract a zip. the only change is I added ingame instructions (and the code to extract the native dlls).