[shadow] Escaping _ in footnotes does not work

[trentm]

_This is a _shadow issue* for Issue 27 on Google Code (from which this project was moved).
Added 2009-07-02T02:12:26.000Z by cljacob...@gmail.com. Closed (Fixed).
Labels: Type-Defect, Priority-Medium.
Please make updates to the bug there.*

Original description

Using markdown2 1.0.1.12, with the footnotes extensions enabled, escaping underscores (_) in a 
footnote leaves an MD5 hash in its place.

Running the following through markdown2:
{{{
memcpy_from_tvm

Testing[^1], more testing [^2], more[^3].

[^1]: memcpy_from_tvm
[^2]: `memcpy_from_tvm`
[^3]: memcpy\_from\_tvm
}}}

using with and without code-friendly
{{{
markdown2 -x footnotes  md5_uh.markdown
markdown2 -x footnotes -x code-friendly md5_uh.markdown
}}}

Generates the following html for the footnotes that use escapes:
{{{
<p>memcpymd5-b14a7b8059d9c055954c92674ce60032frommd5-
b14a7b8059d9c055954c92674ce60032tvm&nbsp;<a href=&quot;#fnref-3&quot; class=&quot;footnoteBackLink&quot; 
title=&quot;Jump back to footnote 3 in the text.&quot;>&#8617;</a></p>
}}}

with code-friendly turned on the first footnote correctly does not generate <em>.