Add minimal support for \hfill (just to handle column alignment in matrices and arrays).  Issue #903.
Add minimal support for \hfill (just to handle column alignment in matrices and arrays).  Issue #903.

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