Executing Gradle builds on Travis CI

Content for this guide is in Asciidoc format and the entry file is contents/index.adoc.
Place new images under contents/images.
Add testable code snippets to src folder as appropriate for this guide.
Commits to master will automatically be published to gh-pages if the build is successful.
To build documentation run ./gradlew asciidoctor and find the results at build/html5/index.html.
To test everything run ./gradlew build.
CI builds are at https://travis-ci.org/gradle-guides/executing-gradle-builds-on-travisci

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