Extend topic tree finder with INavigationRoot support.
Update dependencies.
Use ftw.inflator for generating example content in tests.
Implement IBackReferenceCollector adapter.
Implement section support for topics view.

By default the sections are generated by parents providing INavigationRoot.
This allows dependency-less integration with ftw.subsite for example.
Sort objects by title.
Update translations.
Update dependencies.
Merge pull request #1 from 4teamwork/jone-subsite-support

Section-Filter in topic view (Subsite)