preview posts in stream
Merge pull request #4099 from svbergerem/feature/post-preview

Preview posts in stream
Always redirect user to downcase version of tags on UTF-8 encoding
Merge branch 'brauliomartinezlm-4058_redirect_to_downcase_version_of_tags' into develop
Merge branch 'develop' of https://github.com/diaspora/diaspora