Simplified the test case for ExplicitEulerIntegrator so that it would not take as long
Simplified the test case for ExplicitEulerIntegrator so that it would not take as long

chrisdembia/simbody,scamille/simbody,scamille/simbody,robojukie/simbody,elkingtonmcb/simbody,Gjacquenot/simbody,Gjacquenot/simbody,scamille/simbody,elkingtonmcb/simbody,Gjacquenot/simbody,chrisdembia/simbody,robojukie/simbody,simbody/simbody,elkingtonmcb/simbody,robojukie/simbody,elen4/simbody,simbody/simbody,elen4/simbody,chrisdembia/simbody