modify addCredentials to support generic credentials
fix for decoding query parameters with more than one pct-encoded pair
Merge pull request #303 from mikemckibben/fixes/uriPercentDecode

http: fix pct-encoding problem in UriParser, closes #298
Merge pull request #300 from mikemckibben/improvements/addCredentials

httpx: modify RequestBuilding.addCredentials to support generic credentials
routing: improved and flexibilized FileAndResourceDirectives
routing: add FutureDirectives
routing & http: small improvement in tests
routing: remove `Directive.unwrapFuture`, improve new FutureDirectives
http: fix double-decoding of path component in UriParser, closed #298 (properly this time)
http: add another URI test