Merge pull request #60 from whauwiller/master

Scanning for external parent constraint ref added
isaac set up tractor!
Merge remote branch 'upstream/master'
Rename and delete tools for Maya should be completed.
Merge pull request #61 from jtsai01/master

Rename and delete tools for Maya should be completed.
updated render tool
render version working
set render version for shot
fixed shot selection bug
removed pesky scale preferences
Fix for unrecognized object error