split dependencies into optional features
allow traits to be supplied to import method; this replaces subclassing the parser
keyword traits are simpler, so mention these earlier
minifix
update examples for new extension API

--HG--
rename : examples/lib/MoopsX/Ception/Keyword/Exception.pm => examples/lib/MoopsX/Keyword/Exception.pm
bump version; changelog
Added tag 0.020 for changeset c423a3603e52