work on parsers...
more lens/parser work
tidying lenses
fairly chunky refactor of the parsing/formatting/isomorphism code for consistency and clarity. also stringbuilding for better performance...
more tidying and refactoring
more refactoring of http types and reworked negotiation functions (bit neater now). some new lenses on the way to removing generic types of headers.
more tidying, types, etc.
Merge branch 'feature/http-types' into develop