blogpost into drafts
Add shadow to home jumbatron and emphasize active page in navbar
Center jumbatron images
Added CIKM announcement in Blog/News section
Merge remote-tracking branch 'origin/gh-pages' into new-quickstart-PREVIEW
Merge branch 'origin/gh_pages_fixes' of https://github.com/uce/stratosphere into new-quickstart-PREVIEW
Merge remote-tracking branch 'gith_rm/gh-pages' into new-quickstart-PREVIEW