Remove fonts from default VARIANT values, which where causing -smallOP to no inherit the normal fonts; this caused \int in STIX (and other fonts) not to be found, and so default to unknown character bboxes.  Resolves issue #820.
Remove fonts from default VARIANT values, which where causing -smallOP to no inherit the normal fonts; this caused \int in STIX (and other fonts) not to be found, and so default to unknown character bboxes.  Resolves issue #820.

Ivanwangcy/MathJax,nvp2211/MathJax,nvp2211/MathJax,minrk/components-mathjax,wikimedia/MathJax,cheerfulstoic/MathJax,anueshenxing/MathJax,mcanthony/MathJax,ManrajGrover/MathJax,Galadirith/MathJax,GerHobbelt/MathJax,ManrajGrover/MathJax,cben/MathJax,anusornc/MathJax,anusornc/MathJax,thomasjm/MathJax,thomasjm/MathJax,jinntrance/mathjax,minrk/mathjax-component,thomasjm/MathJax,Edraak/MathJax,jinntrance/mathjax,GerHobbelt/MathJax,rachetfoot/MathJax,minrk/components-mathjax,anueshenxing/MathJax,jeremykenedy/MathJax,Ivanwangcy/MathJax,thomasjm/MathJax,dpvc/MathJax,perseoq/MathJax,Edraak/MathJax,louisd67/formules-science,cheerfulstoic/MathJax,minrk/mathjax-component,mcanthony/MathJax,thomasjm/MathJax,physikerwelt/MathJax,jeremykenedy/MathJax,cben/MathJax,perseoq/MathJax