+pro create akka-http-parent project as an anchor to run aggregate tasks on
=htc #16482 preserve header order during parse
=htc #16501 render custom Date header
=htc #16500 parse Sunday dates and dates with long weekday names correctly

Also, make sure not to parse well-known parameters into the extension block.

Thanks, @richdougherty for the first version of this patch and the additional
test cases.
=htc small cleanup
Merge pull request #16485 from 2beaucoup/header-order-fix

=htc #16482 preserve header order during parse
!str #15964 Remove dependency to persistence

* It will show up again in the right place, in enhanced form, by #16541
Merge pull request #16544 from akka/wip-15964-remove-persistence-dependency-patriknw

!str #15964 Remove dependency to persistence
=htc #16488 add missing assertions in tests

 - replaced pure `===` by `shouldEqual`
 - fixed the backport of spray/spray#927 in ae8c47acc170907ee9c8dfbcb946b400035f6877
 - fixed HttpHeaderParserSpec
+doc apply new docs design to akka-docs-dev
Merge pull request #16457 from spray/w/introduce-http-aggregate-project

+pro create akka-http-parent project as an anchor to run aggregate tasks on
Merge pull request #16551 from ktoso/docs-dev-styling

+doc apply new docs design to akka-docs-dev
!str #16455 Remove unused fanout settings
Merge pull request #16489 from spray/w/16488-fix-http-tests

=htc #16488 add missing assertions in tests
!str #16557 Rename Source.singleton to Source.single
=str #16479 Make constructor of FreeDirective internal
+doc quickstart docs for akka streams, initial version
Merge pull request #16526 from ktoso/docs-streams-quickstart-ktoso

akka-streams docs - quickstart
Merge pull request #16558 from akka/wip-16479-FreeDirective-patriknw

=str #16479 Make constructor of FreeDirective internal
Merge pull request #16556 from akka/wip-16455-cleanup-materializer-settings-patriknw

!str #16455 Remove unused fanout settings