Bring up continuous integration for commits and pull requests #14
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-Use more modern build tools (Java 1.8, Gradle 3.3, Gradle Plugin 2.2.3, v25 Build Tools and SDK)
-Make everything build using these tools
-Add a Travis CI configuration which builds code and Javadoc, lints, and runs unit tests
Travis CI is configured to run on any commit or pull request (including this one) as long as a .travis.yml is present. Once this pull request is merged, the restriction on .travis.yml being present will be lifted (just in case someone tries to put together a commit which removes it inadvertently).
See #1