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Does what it says.
Provisionally reverted in r96990 pending test cases.
Asked a followup on bug 19547 as to whether the single-quote is really the only character that needs to be added here. What characters are legit and what aren't? Is there a handy reference?
Reapplied as r97018 with a parser test case.
Note that bits that didn't render before may not immediately start rendering when this goes live later this month due to the caching of math output.
I still suspect more chars are allowed that are still broken, but it doesn't hurt to tweak this for now.