Migrated d3example.js from d3cs-hackathon branch (abwood/cesium fork).
Added d3chart.css for encapsulation of css rules that define the style
for the d3 chart.  Migrated globe.js from d3cs-hackathon branch; updated
to use the CesiumWidget rather than the CesiumViewerWidget.  Will add
Timeline, Shuttlering, etc in future commits.


Signed-off-by: Alex Wood <abwood@gmail.com>