Make models follow the glTF spec in that all models should have Y as the up axis. Cesium Man model is still broken.
Fixed Cesium Man model.
Fixed models to use correct up axis.
Fix typo in documentation for `EarthOrientationParameters` class: Abbreviation for the International Celestial Reference Frame is ICRF, not ITRF.
Brought Cesium Air spec model in sync with the Sandcastle example.
Merge remote-tracking branch 'agi/master' into up-axis
Fixed merging issue.
Added unit test for northUpEast transform and updated the changes.md file.
Fixed Cesium Man one last time.
Merged agi/master into up-axis branch.
Fixed unit tests for northUpEast axes functions.
add missing Cesium.
Merge pull request #1873 from tfili/up-axis

Up axis
Merge pull request #1889 from AnalyticalGraphicsInc/exampleCleanup

Fix errors in doc examples
Merge pull request #1868 from DigNative/master

Fix typo in documentation for `EarthOrientationParameters` class
Add Rene Schwarz to CONTRIBUTORS.md
Merge master to private