Fix setMesh for skinned meshes, as reported by wing64. The joints cache was not updated, and hence the node reported and returned wrong joints.
Added support for resetting the transition time to 0.
Fixed some method names (correct camel case, create replaced by add, upper case fixed) in skinnedMesh.cpp

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3526 dfc29bdd-3216-0410-991c-e03cc46cb475