Bro: minor errorformat fix, and highlighting.
Markdown: Added initial version of Markdown checkers
combine improperly separated checkers
Vim's filetype for Markdown is "markdown".
Markdown lint: cleanup.
Markdown lint: vim-markdown sets filetype to mkd.
Checker-specific logging.

New debug level 32, for logging tracing checkers.
New method checker.log().
Cleanup.
Pylint: remove leftovers from the logging patch.
Filetype groff is actually nroff.
Eruby: fix logging.
New checker for DocBook SGML, mdoc, and text: igor.
Add RelaxNG (RNC) RNV checker
rnc-rnv: Change license to WTFPL
Cleanup.
Merge remote-tracking branch 'remko/rnc-rnv'
Formating.
Minor autoload cleanup.
Disable bash_hack by default.
Solve chicken-and-egg problem with getting ghc-mod version.
Don't change Vim's shell.