refactor parsing of content type attributes
handle nil content_type in ContentTypeAttrs
request logger - rename to clarify some variables as request / response (body & headers); refactor to use local variables passed as arguments instead of instance variables (log tags & request body)
rack logger log all request and response headers
faraday: don't log bodies for binary media types
test binary logging
fix test
minor spacing
Merge branches 'headers' and 'binary' into HEAD
v0.5.0