Add JDK 8 to travis tests
Add JDK 8 to travis tests

ahmadia/AbstractRendering,ahmadia/AbstractRendering,ahmadia/AbstractRendering,JosephCottam/AbstractRendering,JosephCottam/AbstractRendering,JosephCottam/AbstractRendering,ahmadia/AbstractRendering,JosephCottam/AbstractRendering,ahmadia/AbstractRendering,JosephCottam/AbstractRendering