Feature/news

News system for the site:

- Admin User has access to an admin Page, from where he can go to create some news
- News contains a title and a body, that can contain Markdown
- Allow to preview the news

To do: 
- Sanitize Input from user to prevent xss (really easy to do with current system)
- We're loosing the new lines from what the users type, so Markdown gets broken
- Make it less ugly
- More options for the feed (page system, not just the last 10)
- Add the tags system
- Scope the permission


Not sure if it's worth it to merge yet but I just want to have a place to track the feature