Add travis configuration file to master branch
http://travis-ci.org/ is a service that does automated builds for every change in a git repository.
Currently it works only for github projects but as the TYPO3 repository is also automatically synced to
github we can take advantage of that platform to automatically check the integrity of TYPO3.
For this to work, we only need to add a .travis.yaml file in the root of the project which configures travis
and holds the basic scripting needed to execute a build.
For now we "only" execute unit tests after a change has been merged.
In the future we eventually will be able to also execute the test for every change request and probably
also move the code sniffer checks from ci.typo3.org to travis.
The build results in travis look like this: