add demo tag
Merge branch 'master' into linkSandcastleExamples
Allow SelectionIndicator to move offscreen with an object.
Update README.md
Tweak README.md
Fix sample code in Clock.js doc
Merge pull request #1953 from PatMahoney/master

Fix sample code in Clock.js doc
Added Pat Mahoney
Merge pull request #1951 from AnalyticalGraphicsInc/selection-offScreen

Allow SelectionIndicator to move offscreen with an object.
Doc external links open in new windows.
Merge pull request #1948 from AnalyticalGraphicsInc/linkSandcastleExamples

Doc link to sandcastle examples
Merge remote-tracking branch 'origin/master' into issue1955
Merge pull request #1957 from AnalyticalGraphicsInc/issue1955

Doc external links open in new windows.
Merge remote-tracking branch 'origin/master' into gltf-8