Update CMakeLists.txt
Update CMakeLists.txt

Simply fixed some typo's and fixed spacing and commenting as well as to be more consistent.
elkingtonmcb/simbody,Gjacquenot/simbody,chrisdembia/simbody,scamille/simbody,robojukie/simbody,Gjacquenot/simbody,Gjacquenot/simbody,simbody/simbody,scamille/simbody,simbody/simbody,elkingtonmcb/simbody,chrisdembia/simbody,chrisdembia/simbody,robojukie/simbody,robojukie/simbody,scamille/simbody,elkingtonmcb/simbody