check for null collision object in RayResultCallback
Merge pull request #8 from VirusFree/pull_request

check for null collision object in RayResultCallback
fixes for double precision
add Move() for characters
Add IsEnabled for KinematicCharacter
fix matrix math
get shapes from contact point
report manifold contact count (as to avoid getting manifold in c# just to check contact count)
add scale setter for UniformScalingShape
add helper to compute compound shape connectivity
workaround for static actors shape
fix build error
allow null CollisionShape and MotionState
fix vs2013 solution path
remove _fixedBody from RaycastVehicle
more checks for null input handling