Change the metadata format to YAML

Change the metadata format to a single YAML file, with a slightly
different internal representation, whose default location is
docs/docknot.yaml.  The new docknot update command (or the
App::DocKnot::Update module) will convert from the old JSON format.
The new metadata format is checked against a schema when read.
DocKnot now depends on YAML::XS and Kwalify.

Word wrap numeric lists and, in Markdown output, quoted paragraphs.
Previously these preserved the original spacing from the input text
snippets.

Require paragraphs be indented by at least six spaces, not five, to be
treated as verbatim paragraphs and left unwrapped.  (Markdown
paragraphs can still use four spaces because they are wrapped in
markup lines.)

1 files changed, 7 insertions, 5 deletions

diff --git a/README.md b/README.md
index 49fabb8..4b63c49 100644
--- a/README.md
+++ b/README.md
@@ -13,11 +13,11 @@ distributed under a BSD-style license.  Please see the section
 ## Blurb
 
 DocKnot is a system for generating consistent human-readable software
-package documentation from metadata files and templates.  The metadata is
-primarily JSON files, but can include files of documentation snippets.
-The goal is to generate both web pages and distributed documentation files
-(such as `README`) from the same source, using templates for consistency
-across multiple packages.
+package documentation from a YAML metadata file and templates.  The goal
+is to generate both web pages and distributed documentation files (such as
+`README`) from the same source, using templates for consistency across
+multiple packages.  DocKnot also automates generating distribution
+tarballs for software packages.
 
 ## Description
 
@@ -63,9 +63,11 @@ The following additional Perl modules are required to use it:
 * IPC::Run
 * IPC::System::Simple
 * JSON::MaybeXS
+* Kwalify
 * List::SomeUtils
 * Perl6::Slurp
 * Template (part of Template Toolkit)
+* YAML::XS
 
 ## Building and Installation