ignore the node_modules directory

however, this requires reinstalling the connect module,
which is used in server.js, so maybe we want to add the connect
module to the repository later. Removing this ignore should not
be necessary (at the moment).
Squashed 'cesium/' content from commit f7dd954

git-subtree-dir: cesium
git-subtree-split: f7dd954ab75bfd284d2b8077faf073b573980c11
add the kml branch of cesium
adjust the paths to the cesium files (script and stylesheet)
load kml data and use the cesium viewer to visualize it
add a small part of the kml testing data
ignore the node.js modules in cesium
Merge branch 'master' into zoom_to_extent

Conflicts:
	cesium/.gitignore
	new.html