Don't build on Oracle JDK 7 anymore
Don't build on Oracle JDK 7 anymore

Travis switched from Ubuntu Precise images to Ubuntu Trusty images. The
Trusty images don't have installed Oracle JDK 7. See
travis-ci/travis-ci#7884 We still build System
Rules with OpenJDK 7. Therefore it is fine to not build it with Oracle
JDK 7.

mplacona/java-junit-template-project