Fix travis builds due to unavailable JDK versions #117
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Description
Travis no longer includes oraclejdk7 or openjdk6, so don't try to build them. This was triggering build failures for all PRs since they've been removed. We will no longer be testing jdk6, but it has already been long unsupported.
Also add openjdk8 and oraclejdk8 builds.
See: travis-ci/travis-ci#7884
Testing
Make sure the builds pass.