Allow \Big and its brethren to have the delimiter in braces.  Resolves issue #632.
Allow \Big and its brethren to have the delimiter in braces.  Resolves issue #632.

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