Added Proposed Status

Added a new Status value of Proposed.

Signed-off-by: Herb Bowie <hbowie@mac.com>
Better Handling for IDs

Added code to deal with IDs

Signed-off-by: Herb Bowie <hbowie@mac.com>
Added Logic to Generate a Table of Contents

Added the ability to convert an included Markdown file to a Markdown file with an embedded table of contents (via use of the '.mdtoc' file extension).

Signed-off-by: Herb Bowie <hbowie@mac.com>