Added support for Twitter Cards.
Merge branch 'master' into feature/twitter-cards

Conflicts:
	_includes/head.html
Added a new blog entry about "SlipStream and Amazon IAM".
Add North America address
Can we bring back the SixSq logo in the footer?
AWS IAM blog
Merge branch 'blog/amazon-iam' of https://github.com/SixSq/sixsq.github.com into blog/amazon-iam
Minor changes
Minor update
Minor update
Merge pull request #9 from SixSq/feature/twitter-cards

Added support for Twitter Cards.
Added use cases for NuvlaBox
Removed duplication regarding product sub pages
Introduced new layouts and includes to simplify use case definition
Add nutshell section
Minor
Adjust support calls
Small Changes to use cases pages
Fix link menu activation and a few more minor updates
Merge branch 'usecases' of https://github.com/SixSq/sixsq.github.com into usecases

Conflicts:
	_posts/nuvlabox/4000-01-01-product-c-nuvlabox.md
Further updates from feedback
Add SipStream use cases and nutshell
Use cases review