= io: fix Tcp.SO.reuseAddress not being applied for outgoing connections, fixes #712

Backport of akka/akka@6ebf6717c9db4c57d5b918342f578a6120e19b5a

See https://github.com/akka/akka/pull/1849
Merge pull request #713 from jrudolph/i/712/backport-akka-fix

= io: fix Tcp.SO.reuseAddress not being applied for outgoing connections, fixes #712
Merge pull request #710 from jrudolph/w/add-directive-documentation

Add documentation for AnyParamDirectives and BasicDirectives (+ some directive link fixes)
+ http: add some more helpers around form data and `BodyPart` construction
Merge pull request #715 from spray/wip/small-stuff

+ http: add some more helpers around form data and `BodyPart` construction
= http: missing scalariform auto-formatting
= project: update CHANGELOG for final
= docs: update current-versions
Merge pull request #718 from jrudolph/w/add-directive-documentation

More directive documentation (+ inflation of magnet parameters in signatures)
= site: update webinar charts with link to recording
Merge remote-tracking branch 'origin/master'
= site: update all docs to final versions
= docs: add link to #scalax session
= docs: add MiscDirectives documentation