Merge pull request #4 from jfrankl/master

Styling updates
Added sun slider
files for sun slider
"simulated" altitude
Styling changes
Increase opacity on the hillshade layer
Remove terrain map
Move marker and default map location for a more exciting first map view
Change copy, remove the icon navigation, move legend
Add transit icons
Merge branch 'feature/demo' of http://github.com/echeipesh/geotrellis-site