Update AsciiMath to include changes since v2.6.  Resolves issue #1605
Update AsciiMath to include changes since v2.6.  Resolves issue #1605

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