Fixes #206

Making HttpServerRequest.getContent() and HttpClientResponse.getContent() lazily subscribable.
Merge branch 'master' of https://github.com/Netflix/RxNetty
Added missing copyrights
Making HttpClient.submit() returning only a single item (as expected)

Also disabling mavenLocal() from the build. This causes cloudbees builds to fail if the local repo gets corrupted.
Modified links to point to ReactiveX
Fixed issues link
Removing pre-created exception instances from UnicastContentSubject.
Merge pull request #207 from NiteshKant/master

Fixes #206
Fixes #199

Wrong metric event was being used.
Updated CHANGES.md for release 0.3.12
Merge pull request #212 from NiteshKant/master

Fixes #199