First cut at DynamicScene/CZML WallGeometry support.
Merge branch 'master' into dynamicScene-wall-geometry
getIntervals should be intervals.
Merge branch 'master' into dynamicPath-crash
Merge remote-tracking branch 'origin/master' into dynamicScene-wall-geometry
Add Navigation Help widget.
Fix incorrect example and destroy method.
Tweak instruction text.
Make help window slightly smaller.
Changes from review.
Fix copy/paste error.
Merge remote-tracking branch 'origin/master' into dynamicScene-wall-geometry
Add Rectangle support to DynamicScene

Still needs specs and cleanup.
Merge branch 'master' into dynamicScene-rectangle
Ongoing DynamicRectangle work

Fix type in CzmlDataSource
Add coordinates property.
Start refactoring Datasource interface

Manually extract all non-dataSourceBrowser specific changes out of the `dataSourceBrowser` branch.
Turn DataSource get methods into ES5 properties.
DynamicRectangle specs and cleanup.
Update CHANGES.
Merge remote-tracking branch 'origin/master' into dynamicScene-wall-geometry