complete for now implementation of language tags with basic round trip testing for RFC example forms
language tag implemented, integrated with representation. language range implemented for accept-language prior to negotiation re-implementation
some more test coverage of parsers, etc. plus some slight renaming around some of the types. "invented" types, usually unions for choices of pseudo-ranges, have been named <prefix>Range to match MediaRange and LanguageRange. additionally, ContentLocation has been made a single case top level DU, to bring things in to the common form for headers
more work on parsers/types, more tests, some general tidying
more tests for rfc 7234, plus support for strong/weak etags in rfc 7232
Merge branch 'develop' of github.com:freya-fs/freya into develop