Mostly complete topojson support.
Merge branch 'master' into topojson
Finish TopoJSON support.
Update CHANGES.
Recognize common geojson extensions.
Preserve "use strict" directive in combined and minified output.
Fix relative path to mainConfigFile
Update CHANGES.md
Merge pull request #908 from AnalyticalGraphicsInc/fixUseStrict

Preserve "use strict" directive in combined and minified output.
Merge pull request #906 from AnalyticalGraphicsInc/topojson

Add TopoJSON support to GeoJsonDataSource
Add screenshot for Sandcastle example
Merge remote-tracking branch 'origin/master' into perInstanceAttributes
Merge branch 'perInstanceAttributes' into batching