Improve Streams UI
Change header with nav items
Fix details for the demo
Merge branch 'sp3.demo' of github.com:projectcs13/sensor-cloud-website into sp3.demo

Conflicts:
	app/views/streams/_form.html.erb
Merge branch 'sp3.demo' of github.com:projectcs13/sensor-cloud-website into sp3.demo
Last minor changes for the demo