Merge pull request #2 from jfrankl/master

Fix styling, reconfigure navigation button, add zero marker on slider
Merge pull request #3 from jfrankl/master

Add button images
Added hill shade demo page
added git attributes
Converted hills to int raster for speed
Transit demo site
small refactor + load delay

2nd and third screens will not render until you switch to them
Added JavaOptions for site project
removed host filter from service
Add emphasis to 'GeoTrellis' under interactive maps
hillshade uses static number of breaks
faster hillshade, color-ramp needs tweaking
playing with the zfactor
made the colors a little darker
Modify slider
Create controller and controller wrapper classes
Merge branch 'feature/demo' of http://github.com/echeipesh/geotrellis-site
Update styles
Modify color ramp