Merge pull request #23 from rickard2/feed

RSS feed for blog posts
Fixed issue #20

I added a Hack bundle
composer update
Added blog post about November Camp
Update README.md
Merge pull request #26 from symfonyse/new-blog-post

Added blog post about November Camp
added sponsor blog post
Merge remote-tracking branch 'origin/master'
decreased cache for blog post on startpage.
Fixed broken RSS feed and added test