add sitemap component

For each homepage a sitemap.xml is dynamically created using the search
capabilities of the Infopark platform. Some obj classes like images or
container are excluded from the sitemap. The sitemap is easily
extendable by editing the sitemap controller.
bugfix: regression test failed because slider partial was changed
Merge branch 'feature/sitemap' into develop

* feature/sitemap:
  bugfix: regression test failed because slider partial was changed
  add sitemap component