Added skins, morphs to 3DSMax Exporter

We had some 3DSMax files with skinned animation and morphtargets we wanted to show on our website, so I made a new maxscript exporter to export them. The script merges objects if more than one is selected and exports any skinned animation and/or morphtargets it finds.

I also added an example with output from the script.

Let me know if any of this needs cleaned up.