Fix Travis JDK config
Merge pull request #71 from LBliss/issue/69

Fixed the wrong sizes for char arrays.
Travis: only build on JDK7 for now
Merge pull request #78 from scala/topic/travis-jdk-config

Travis: only build on JDK7 for now
Merge branch '2.10.x' of https://github.com/scala/pickling into 2.10.x