Escape pipe in code section of table leaves escape character

Escaping a pipe in the code section of a table keeps the escape character when the spec shows that it shouldn’t.

Steps to reproduce the problem (provide example input):

| f\|oo  |
| ------ |
| b `\|` az |
| b **\|** im |

Expected behavior:

<table>
<thead>
<tr>
<th>f|oo</th>
</tr>
</thead>
<tbody>
<tr>
<td>b <code>|</code> az</td>
</tr>
<tr>
<td>b <strong>|</strong> im</td>
</tr></tbody></table>

Actual behavior:

<table>
<thead>
<tr><th>f|oo</th></tr>
</thead>
<tbody>
<tr><td>b <code>\|</code> az</td></tr>
<tr><td>b <strong>|</strong> im</td></tr>
</tbody>
</table>

Links: https://github.github.com/gfm/#example-193

[robinst]

Merged, will be in the next release (0.13.0).

[robinst]

Working on this on a new branch: https://github.com/atlassian/commonmark-java/compare/issue-149-gfm-table-spec-changes?expand=1