First cut at DynamicScene/CZML WallGeometry support.
Merge branch 'master' into dynamicScene-wall-geometry
getIntervals should be intervals.
Merge branch 'master' into dynamicPath-crash
Merge remote-tracking branch 'origin/master' into dynamicScene-wall-geometry
Fix #1605, Sandcastle drop-downs don't work in Firefox
Enable asynchronous geometry processing in DynamicScene.

1. GeometryVisualizer now creates static geometry asynchronously.
2. `Clock.canAnimate` was added to prevent the clock from advancing time even when `shouldAnimate` is true
3. Visualizers' update functions now return a boolean value indicating if it is okay to advance time.
4. `DataSourceDisplay.update` now returns false if any of the visualizer update calls return false.
5. The `Viewer` assigns `Clock.canAnimate` the result of `DataSourceDisplay.update`, which prevents time from animated if asynchronous geoemtry is processing.
6. `Viewer.allowDataSourcesToSuspendAnimation` was added to control this behavior in client apps.
Default allowDataSourcesToSuspendAnimation to true.
Update CHANGES.
Remove Google Chrome Frame

Google has discontinued Chrome Frame and prints a console message indicating it no longer prompts.

`Google Chrome Frame is being retired, so the CFInstall.check method no longer notifies the user; see http://blog.chromium.org/2013/06/retiring-chrome-frame.html for more information.`

Fix #1376
Fix #1603

#1603 only affected non-time-varying data sources.  After the last revamp of the Property system,  `DataSource.getIsTimeVarying` is actually no longer needed and removing it fixes a whole host of issues similar to #1603.
Add missing documentation.
Merge remote-tracking branch 'origin/issue1603' into visualizer-refactor

Conflicts:
	Source/DynamicScene/DataSourceDisplay.js
Factor out Visualizer interface

It turns out a `Visualizer` instance only needs `update` and `destroy` functions.  Also start cleaning up other visualizer to conform to the interface and remove uneeded cruft.
Add specs and fix problem uncovered by them.
Remove comments about IE8-style button mapping.
Merge pull request #1615 from AnalyticalGraphicsInc/sandcastle-select

Fix #1605, Sandcastle drop-downs don't work in Firefox
Merge pull request #1619 from AnalyticalGraphicsInc/issue1603

Fix #1603
Merge branch 'master' into dynamicScene-buffering

Conflicts:
	Source/DynamicScene/DataSourceDisplay.js
Tweak CHANGES.md