site: add Atom feed to blog
can: explicitly name connection actors
routing: add `complete(Future[StatusCode])` overload
Update docs/documentation/spray-routing/key-concepts/directives.rst

Fix spelling mistake.
http: add HttpMessagePart extractor
io: change IOExtension.ioBridge to IOExtension.ioBridge()
http: allow UTC as well as GMT time zone label in Date header
site: refactor and extend blog infrastructure
docs: add magnet pattern blog post
http: change default marshalling encoding to UTF-8
docs: small fix in page template
docs: small fix in atom feed template
util: change LoggingContext.fromActorRefFactory to show the ActorPath rather than ActorRef classname (in SLF4J logging)
docs: fix type in magnet pattern post
Merge pull request #172 from rikf/patch-1

docs: small typo fix
docs: add additional info for users with SBT runners not capable of dealing with grouped arguments
http: loosen language-tag parser to also accept tags according to BCP 47, closes #168
testkit: turn MatchError into proper error message, closes #165
docs: fix bugs in testkit installation section
io: small simplification in IOExtension