This is what seems like the sensible default: read in insertions, and
ignore deletions. In the future, it would be good if options were
available for either taking in deletions or keeping both in some
scriptable format.
Add torture-test for new normalization functions.
One problem that this test demonstrates is that word has a tendency to
turn off formatting at a space, and then turn it back on after. I'm not
sure yet whether this is something we should fix.
This is just a wrapper around Pandoc that doesn't normalize with
`toString`. We want to make sure that our own normalization process
works. If, in the future, we are able to hook into the builder's
normalization, this will be removed.
