Fixed CMakeLists.txt so all headers would be installed correctly.
Fixed CMakeLists.txt so all headers would be installed correctly.

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