Merge branch 'develop'
updated version numbers
fixed null error
fixed code style
Merge pull request #35 from sulu-cmf/hotfix/content_path

[HOTFIX] Fixed null error in content_path twig function
Update composer.json
updated version numbers
Integration of view-data
Merge pull request #37 from sulu-cmf/feature/view-data

Integration of view-data
implemented sitemap generator
init xml sitemap generation
added twig extension
remove unpublished sites between
render xml content
used correct path for routes
implemented read homepage
fixed comment
use array instead of structure in twig
fixed internal / external link
removed example phpdoc