Make safe extension properly handle scriptlevel of 0. (mathjax/MathJax#2745) #768
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The Safe extension was returning a number rather than a string when it filters the
scriptlevel(andscriptSizeMultipler) attributes, and so a script level of 0 would end up reading as false rather than a string consisting of 0, and so the script level was filtered out. This PR returns strings for these attributes.Resolves issue mathjax/MathJax#2745.