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