Add a basic travis configuration.
Merge pull request #4 from marcjansen/enable-travis

Add a basic travis configuration.
Show travis build status in README.
Merge pull request #5 from marcjansen/show-travis-build-status

Show travis build status in README.
Updated the versions of some dependencies.
Merge pull request #3 from buehner/dependency-version-updates

Updated the versions of some dependencies.