News| Basic news creation form

Currently only renders a preview of the message rendered from Markdown
Chosen rendering engine is Kramdown
News| WIP| database for news
News| Remove residual artifact from editing
News| Allows to save news_article and to display the feed
Common Code| Add admin page
News| Tinkering with the links in the nav_bar
Common Code| Rename function to check if current_player is admin
Common Code| Limit access to the admin Panel
News| Add Draft mode and improve Preview/Edit/Publish cycle
Clean| Use before_action instead of before_filter
Clean| Remove long explanatory comments in route.rb
News| Switch to a resource for routing and rename News->NewsArticle
News| Rename the controller according to rails convention

Note: Fuck convention over configuration
News| Use mass assignment for the ActiveRecord changes
News| Remove the id getting in separate lines
News| Reorder Controller for a more logical ordering
News| Restrict access to admin users
News| Handle article not found case, hide unpublished article
Merging development into feature/news
Merge branch 'feature/news' into development