Added some functions to camera to help calculate edge of screen collider.
Merge branch 'master' of https://github.com/jillytot/polyKnights_Clean

# By Jesper Lehmann Poulsen
# Via Jesper Lehmann Poulsen
* 'master' of https://github.com/jillytot/polyKnights_Clean:
  Players now respawn when they jump off the map.