Change versions on website to 0.4 and 0.4-hadoop2
add rss feed
add latest blogposts to start page
add version information to front page.
Merge remote-tracking branch 'gith_ozone/gh-pages' into rmetzger_preview
Merge branch 'pages-release04' into rmetzger_preview
Merge branch 'mongodb' into rmetzger_preview

Conflicts:
	_config.yml
	feed.xml
extend blogpost
Merge remote-tracking branch 'gith_ozone/gh-pages' into rmetzger_preview
Merge branch 'aws_blog' into rmetzger_preview