Remove caching.  Timings show that it is no longer a measurable improvement.  Worse, TSPAN collisions are causing mis-renderings. Review URL: https://codereview.appspot.com/7645044
Remove caching.  Timings show that it is no longer a measurable improvement.  Worse, TSPAN collisions are causing mis-renderings.
Review URL: https://codereview.appspot.com/7645044

git-svn-id: 2cf55447cea94972d775c94cce66c944ede0459c@696 c400ca83-b69d-9dd7-9705-49c6b8615e23

TechplexEngineer/EasyJ4FRC,carlosperate/ardublockly,TechplexEngineer/EasyJ4FRC,CocoMake7/CocoBlockly,kallex/blockly,kallex/blockly,CocoMake7/CocoBlockly,adrgerez/ardublockly,carlosperate/ardublockly,adrgerez/ardublockly,adrgerez/ardublockly,CocoMake7/CocoBlockly,TechplexEngineer/EasyJ4FRC,TechplexEngineer/EasyJ4FRC,carlosperate/ardublockly