Moved the modeling stuff to simmodel. Added some new introductory material explainign the structure of a simulation in SimTK.
Moved the modeling stuff to simmodel. Added some new introductory material explainign the structure of a simulation in SimTK.

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