* haunt/skribe.scm: New file.
* haunt/skribe/utils.scm: New file.
* haunt/reader/skribe.scm: New file.
* configure.ac: Check for guile-reader.
* Makefile.am (SOURCES): Add Skribe modules when guile-reader is
available.
* example/haunt.scm: Include Skribe reader.
* example/posts/baz.skr: New file.
* README.md ("Requirements"): Mention guile-reader as optional dependency.