Clean up the falling ball DEM demo.
Clean up the falling ball DEM demo.

Bryan-Peterson/chrono,armanpazouki/chrono,Bryan-Peterson/chrono,projectchrono/chrono,PedroTrujilloV/chrono,projectchrono/chrono,jcmadsen/chrono,rserban/chrono,amelmquist/chrono,Bryan-Peterson/chrono,rserban/chrono,tjolsen/chrono,jcmadsen/chrono,scpeters/chrono,dariomangoni/chrono,armanpazouki/chrono,tjolsen/chrono,rserban/chrono,PedroTrujilloV/chrono,amelmquist/chrono,Milad-Rakhsha/chrono,tjolsen/chrono,tjolsen/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,rserban/chrono,andrewseidl/chrono,andrewseidl/chrono,amelmquist/chrono,jcmadsen/chrono,andrewseidl/chrono,armanpazouki/chrono,scpeters/chrono,rserban/chrono,hsu/chrono,amelmquist/chrono,dariomangoni/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,PedroTrujilloV/chrono,scpeters/chrono,rserban/chrono,projectchrono/chrono,scpeters/chrono,dariomangoni/chrono,Milad-Rakhsha/chrono,Bryan-Peterson/chrono,amelmquist/chrono,hsu/chrono,Milad-Rakhsha/chrono,Bryan-Peterson/chrono,projectchrono/chrono,scpeters/chrono,andrewseidl/chrono,andrewseidl/chrono,hsu/chrono,armanpazouki/chrono,armanpazouki/chrono,dariomangoni/chrono,jcmadsen/chrono,rserban/chrono,amelmquist/chrono,dariomangoni/chrono,jcmadsen/chrono,dariomangoni/chrono,jcmadsen/chrono,hsu/chrono,armanpazouki/chrono,Milad-Rakhsha/chrono,PedroTrujilloV/chrono,PedroTrujilloV/chrono,hsu/chrono,projectchrono/chrono,tjolsen/chrono