* doc/haunt.texi ("Readers"): Add menu. ("Reader"): Change Readers to a subsection. ("Texinfo"): Add Textinfo subsection. ("Skribe"): Add Skribe subsection. ("CommonMark"): Add CommonMark subsection.
* doc/haunt.text ("Requirements"): Add guile-commonmark. * README ("Requirements"): Add guile-commonmark.
* haunt/reader/commonmark.scm: New file. * Makefile.am (SOURCES): Add it. * configure.ac: Check for guile-commonmark.