2.12 roadmap

review by @sjrd / @retronym / @gkossakowski / @lrytz / @phaller
Suggest to reword as:


During the development of Scala 2.11, we've made big steps forward in automating our [release process](https://scala-webapps.epfl.ch/jenkins/view/scala-release-2.11.x/job/scala-release-2.11.x/) and regression testing via our [Community Build](https://jenkins-dbuild.typesafe.com:8499/view/Shared/) which builds 1M LOC of popular open source projects. Both the release script and the community builds are also run on a nightly basis.

As such, as of Scala 2.11.1, we've decided to skip Release Candidates for 2.x.y releases where y > 0. This enables more frequent minor releases on a predictable schedule.