convert PerformanceDisplay from canvas to div
update cesium viewer for changes
Merge branch 'master' into performanceDisplay
update style
update cesium viewer
update doc
Add support for a minimum level on OpenStreetMapImageryProvider
Update CHANGES.md
Add CZML description property handling.
Primitive descriptions for GeoJson, based on the balloon branch.
Imrpove GeoJSON name heuristic.
Minor cleanup and sanity tests.
Merge remote-tracking branch 'origin/master' into description
Replace incorrect @see with @link
Fix two more broken links.
Merge pull request #1418 from AnalyticalGraphicsInc/seelink

Replace incorrect @see with @link
Fix bad test.
Merge pull request #1417 from AnalyticalGraphicsInc/description

Description property for CZML
Check the number of tiles at the minimum level
Merge pull request #1409 from andre-nunes/minLevel

OpenStreetMapImageryProvider can now make use of minimum level