sagemath/sagenb — pull request #284 by kcrisman (2014-12-08 18:34:53+00:00)
Title: Cache bust canvas3d so they reload properly

This is a very minimal fix that works beautifully. This should fix #255 and Sage Trac http://trac.sagemath.org/ticket/11275 as well.

No point in moving to Python 3 formatting for that part of the file just for this.