Put Cesium Inspector back on the main menu.
Added Kevin's suggestion to the main menu.
modify Matrix2, 3, 4
Merge branch 'requireResultCartesian' into requireResultMatrix
core
Merge branch 'requireResultCartesian' into requireResultMatrix

Conflicts:
	Source/Core/IntersectionTests.js
source
specs
spec cleanup
fix most test
fix model
add result tests
Merge branch 'master' into requireResultMatrix

Conflicts:
	Source/Scene/CameraFlightPath.js
Update CHANGES.md
cleanup
Merge pull request #1764 from AnalyticalGraphicsInc/inspector

Put Cesium Inspector back on the main menu.
Flip CZML pixel offset origin for billboard and label.

Because CZML is not yet versioned, we can't distinguish new from old CZML.  So, until we implement all our breaking changes in CZML 1.0, keep the existing convention in CZML.
Properly handle flipping sampled pixel offset values.
Remove Fresnel, Reflection, and Refraction materials.
Update CHANGES.md