Modified the functions, but still not behaving
Fixed run button behaviour when no world is loaded
Simulator draws the scene immediately after loading
Scaled Khepera3 back to original size. Zoomed the simulator on the default scene.
Collision detection using pylygon
Multiple selection in file dialogs now forbidden
Merge branch 'wxUI' of github.com:whittenjaw85/pysimiam into wxUI

Conflicts:
	scripts/simulator.py
Merge branch 'wxUI'
Merge branch 'physics'

Conflicts:
	scripts/simulator.py
Merged physics engine with supervisor.