update Scala 2.11.8, use new Java8 Backend
update Scala 2.11.8, use new Java8 Backend

- https://github.com/scala/make-release-notes/blob/9cfbdc8c92f94/experimental-backend.md#emitting-java-8-style-lambdas
- http://d.hatena.ne.jp/xuwei/20150626/1435282696

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