Add Travis-CI build configuration file
Fix failing build because build configuration was using the wrong configuration parameter for the install command. Install needs to skip archive signing.
Specify a Findbugs version to use that is compatible with Java 6
Remove oraclejdk8 from build configuration as it is not compatible with Findbugs 2.x, which is required to build with openjdk6. For backward compatibility, currently prefer jdk6 over jdk8
Add the Travis-CI 'Build status' icon on the README page
Add the Travis-CI 'Build status' icon on the actual README page, not just the template