Added separate listing of unfinished songs
Update TODO.md
Merged TODO.md
Updated dependencies
Moved transposer key from URL to GET parameter

To make easier room for title slug
Updated dependency versions
Added canonical meta tag

Should hopefully improve Google search result mess caused by all the
different transposed version.
Also cleaned up some XHTML -> HTML tags
Set list-style:none for song lists under books
Prepared url structure for pretty urls

Also did an overhaul in mustache templates.
Updated TODO.md
Updated TODO.md