make naked.el mandatory
kmu-key-description: remove most of doc-string

The removed parts will come back along with tests.
kmu-key-description: always return naked description

Remove the NAKED argument.
kmu-key-description: cosmetics
kmu-key-description: add FIXME notice
kmu-{define,remove}-key: always use naked-edmacro-parse-keys
kmu-parse-key-description: rename from kmu-edmacro-parse-keys
remove dependency on naked.el
cleanup section headings
quiet byte-compiler
bump to 0.5.0