Add Int32Array and Uint32Array support to ComponentDatatype

Fixes #1647
Fix typo in comment.
Specs for ComponentDatatype
Merge remote-tracking branch 'origin/master' into issue1647
Changes after review.
Merge branch 'master' into issue1647
Properly compute numberOfVertices when unpacking geometry indices.
Merge remote-tracking branch 'origin/master' into issue1647
Remove some use of private _globe.
Code cleanup
Merge pull request #1650 from AnalyticalGraphicsInc/issue1647

Properly pack geometry indices for vertices greater than 64k
Merge pull request #1655 from AnalyticalGraphicsInc/private-globe

Remove some use of private _globe.
Use fragmentDepth instead of getFragmentDepth.
Check framebuffer status before attempting to render.
Merge pull request #1657 from AnalyticalGraphicsInc/issue1656

Fix Issue 1656
Add DynamicModel and CZML support for Model.minumumPixelSize.
Merge pull request #1658 from AnalyticalGraphicsInc/issue1568

Fix Issue 1568
Fix typo
Merge pull request #1659 from AnalyticalGraphicsInc/dynamicModel-minimumPixelSize

Add DynamicModel and CZML support for Model.minumumPixelSize.
Merge remote-tracking branch 'origin/master' into visualizer-refactor