Add: Travis-CI
Merge branch 'feature/travis-ci' into develop

* feature/travis-ci:
  Add: Travis-CI
Merge branch 'develop'

* develop:
  Add: Travis-CI
  Fix: php requirement position in composer.json
Fix: composer.json
Merge branch 'master' into feature/gaufrette

* master:
  Fix: composer.json
  Add: Travis-CI