Fix undefined maxFontSize

Fix getting a NaN maxFontSize in makeVList because symbolNodes don't have a
maxFontSize property.

Test plan:
 - Make sure no huxley screenshots changed

Auditors: alpert
Fix large integrals in IE 8

IE 8 clips the \int sign when it is `display: inline-block`. This fixes that.

Test plan:
 - Make sure no huxley tests changed

Auditors: alpert