An error with `allowframebreaks` option.

[mental689]

Hi Benjamin @benjamin-weiss,

Thank you for your groundbreaking work. I have used your HSRM theme and found that when adding allowframebreaks option to the frame, it produced some errors like:

...
Runaway argument?
! TeX capacity exceeded, sorry [main memory size=5000000].
\reserved@a #1#2->\let #2#1\reserved@a 

l.9 \end{frame}
...

It would be very helpful if you can response in this situation.
Thanks.

[mental689]

It seems like another work also solved the same problem: matze/mtheme#20
I patched your code like the above work told me, and allowframebreaks options can work well now.

However, this issue is still present in HSRM at this moment. That's why I put the reference above for anyone else who may encounter the same issue.