Add Options and Head to RequestBuilding
routing: fix `optionalCookie` directive leaking MissingCookieRejection
routing: add `cancelRejection` directive, improve `authorize` and `respondWithMediaType` directives
routing: extend and improve `respondWithDirectives`
Merge pull request #294 from vjousse/request-building-options-head

Add Options and Head to RequestBuilding
add multiple arguments to setCookie and deleteCookie directives
Merge pull request #295 from andrebeat/feature-cookie-directive

Add multiple arguments to setCookie and deleteCookie directives
http: tiny tweaks in Uri.Query
sbt: upgrade to Akka 2.1.4
can: fix bug in message parser (chunk parser), closes #292
modify addCredentials to support generic credentials
testkit: improve error message for failed 'entityAs' assertions
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)