= docs: add documentation for ParameterDirectives
= docs: when extracting definition lines try not to match method name prefixes as well
+ httpx: add support for specifying an optional log level with logRequest and logResponse

The default log level is still DEBUG but now you can specify your own level. this was already exposed by logValue but had not bubbled up to logRequest/logResponse.
site: add redirect from parboiled.org to github wiki
Merge branch 'master' of github.com:spray/spray
Merge pull request #439 from agemooij/httpx-log-improvements

+ httpx: add support for specifying an optional log level with logRequest and logResponse
Merge pull request #438 from jrudolph/wip/document-parameter-directives

documentation for parameter directives
= can: improve ByteStringRendering perf by replacing ByteStringBuilder with custom logic, closes #444
Merge pull request #449 from spray/wip/better-bytestringrendering

= can: improve ByteStringRendering
= http: seal `ModeledHeader` parent class of predefined HTTP header model classes