Add docs for trignometric local ops.
Merge pull request #20 from sconealone/localopsdocs

Add docs for trignometric local ops.
Merge branch 'master' of https://github.com/geotrellis/geotrellis-site
Merge remote-tracking branch 'upstream/feature/demo'
Merge branch 'feature/demo' of http://github.com/echeipesh/geotrellis-site
Edit styling, change navigation from three buttons to larger "Next: ..." interface
Merge pull request #2 from jfrankl/master

Fix styling, reconfigure navigation button, add zero marker on slider