Work around problem with MathPlayer not being triggered by createElementNS in IE11.  Resolves issue #1074.
Work around problem with MathPlayer not being triggered by createElementNS in IE11.  Resolves issue #1074.

GerHobbelt/MathJax,thomasjm/MathJax,jinntrance/mathjax,jinntrance/mathjax,thomasjm/MathJax,thomasjm/MathJax,thomasjm/MathJax,wikimedia/MathJax,dpvc/MathJax,GerHobbelt/MathJax,thomasjm/MathJax