* Refactored backbuffering into Enable. All Chaco tests passed (that this, the ones that passed before the refactor). 
* Refactored backbuffering into Enable. All Chaco tests passed (that this, the ones that passed before the refactor). 



ContinuumIO/chaco,tommy-u/chaco,ContinuumIO/chaco,burnpanck/chaco,burnpanck/chaco,ContinuumIO/chaco,tommy-u/chaco,ContinuumIO/chaco,burnpanck/chaco,tommy-u/chaco