Remove Skeleton::getBodyNodeIndex() and Skeleton::getJointIndex().
cleaned up LCPSolver
Remove .gitignore in individual sub directories.
Initialize mass and inertia in constructor of BodyNode.
Clear external forces at the end of Skeleton::computeForwardDynamicsID()
Remove Skeleton::computeForwardDynamics2()
Don't call clearExternalForces() in Skeleton::computeForwardDynamicsID() and Skeleton::computeForwardDynamicsFS() because this function is only for calculating ddq
Merge pull request #95 from dartsim/skeleton

Remove Skeleton::getBodyNodeIndex() and Skeleton::getJointIndex().
Merge branch 'origin/master'
Set joint limit enforcement option in Joint.
Remove commented out functions.