Ready for cloudControl

 - remove .buildpath and .project, don't belong into a repository
 - .gitignore
   - remove config.php, cloudControl has better possibilities to configure your application
   - add mysql-ssl-ca-cert.pem, which is used for the initial import
 - .travis.yml
   - currently no tests, but used for deploying new versions
 - ready for cloudControl
   - add Procfile
   - add config.php which uses the credentials
   - update README.md
 - improve session handling with HTTP_X_FORWARDED_FOR