balloon WIP
balloon work continued
change position to function
pointer edge and close button
move to viewerDynamicObjectMixin
documentation
cleanup
style changes
documentation and specs
Merge branch 'master' into balloon

Conflicts:
	Source/Widgets/Viewer/viewerDynamicObjectMixin.js
Generate a simple balloon for GeoJson data to play with.
refactor
fix test
cleanup
Merge branch 'hpinkos-balloon' into mramato-geojson-balloon
Merge branch 'master' into balloon

Conflicts:
	Source/Scene/Scene.js
change position to world coordinate
Merge branch 'hpinkos-balloon' into mramato-geojson-balloon
Updates to `viewerDynamicObjectMixin`

To have it work properly with DynamicObjects.

I also changed the max width/height of the balloon to be much bigger.
Fix typo.