12

ENHANCEMENTS:
* Added option to joints to set collideConnected = False
* Added clear_all (svineet)
* Added tracking (svineet)
* Added tracing (svineet)
* Added erase traces (svineet)
* Added save/restore of pens and traces (svineet)

BUG FIXES:
* Removed cjson dependency for elements
* pep8 cleanup (svineet)