edx/edx-platform — pull request #805 by nedbat (2013-08-27 15:11:08+00:00)
Title: Keep comments in capa XML from causing failures

Comments (and processing instructions!) are handled oddly in lxml.
This change will keep them from causing failures. They will be omitted
from the HTML generated, which is fine, since they aren't needed there.

@cpennington, @adampalay: Look good?