updated composer.json
Broken the set theme logic from contnt portal provider

- Set theme logic is now handled generically in a request
  event listener.
- And renamed portal provider to content provider
fixed tests
Merge branch 'feature/separate-set-theme-listener' into develop
Merge branch 'develop' of git://github.com/sulu-cmf/SuluWebsiteBundle into hotfix/no-link