Updated TODO
Fixed test suite.

- No longer requires aeson-pretty.
- Uses Diff when there are errors.
- Uses correct paths for biblio, csl.
Updated TODO
Made error reporting more informative when bibfile not found.
Updated TODO
Updated TODO
Improved test suite.
Hide findFile from System.Directory 1.2.
Check `~/.csl` for CSL and CSL abbrev files.
Update TODO
Use explicit imports with System.Directory.

Needed to build with older versions.
Removed FromJSON, ToJSON instances for [String].
Updated TODO
Improved README.
Style: Added OErr to Output and FErr to FormattedOutput.

Print OErr as ???.  In Pandoc output, put this in a span element,
so errors can be found and flagged.

citeproc-hs
Print warnings to stdout when bibliography items not found.
Updated tests.
Updated TODO
Explanation of relation to citeproc-hs.
Tweaked description in cabal.