added analytics-key to cache
added possibility to define analytics-key in url in webspace
updated test, reformatted code
refactored code
fixed test for url
fixed indentation in WebspaceCollectionCache
added changelog
Merge branch 'feature/#585-analytics-key' into develop
implemented structure serializer
added serializer to config
extracted strucutre serializer interface
changed caching method to filesystem for preview
removed temp node
removed temp node from init and config
removed temp node from sulu node_helper
removed temp parameter
added changelog and upgrade
removed container from property and instantiate it in the get content data method
fixed content-bundle tests
fixed media bundle tests