Previously the markdown writer printed raw citation codes, e.g.
[geach1970], rather than the expanded citations provided by citeproc,
e.g. (Geach 1970). Now it prints the expanded citations. This means
that the document produced can be processed as a markdown document
without citeproc. Thanks to dsanson for reporting, and arossato
for the patch.
git-svn-id: https://pandoc.googlecode.com/svn/trunk@1871 788f1e2b-df1e-0410-8736-df70ead52e1b