Remove sample coverage to keep in sync with glTF 0.8
Update model tests for glTF 0.8 update
Merge remote-tracking branch 'origin/master' into gltf-8-tweaks
Start of DataSource support for geometry outline width

1. Add `outlineWidth` property to all geometry graphics objects.
2. Update Updaters to expose outline information.
3. Fix issues in DataSource geometry specs.
Start of WEBGL_debug_shaders
Report when link fails
Fix deleteProgram
Upgrade knockout to 3.2.0

https://github.com/knockout/knockout/releases/tag/v3.2.0
Update CHANGES.md
Upgrade to CodeMirror 4.6

Everything works, except for autocomplete.  More cleanup and testing needed.
Fix Sandcastle autocomplete and doc support

Also remove Cesium-hint.js as it's no longer needed.
Update CHANGES.md

Also remove uneeded CSS class.
Fix gutters.
Merge remote-tracking branch 'origin/master' into codemirror-4.6

Conflicts:
	CHANGES.md
Merge remote-tracking branch 'origin/master' into knockout-3.2.0

Conflicts:
	CHANGES.md
Update simple.czml

This gets rid of curved access lines and is also a much smaller file
due to recent toolchain upgrades.
Compress Primitive texture coordinates.
Support detached ReferenceProperty instances

Previously, ReferenceProperty required that it's reference was always
resolved.  This enforces early failure for bad data (such as a CZML file
that references a non-existent property).  Unfortunately, this lead to
problems when manipulating data on the client that would result in
temporary or permanent detachment of references, for example #2044.

In order to address this, I've made a slight change to the reference
semantics which cause a ReferenceProperty that already has a value
to maintain that value if it ever becomes detached (i.e. the entity
it references is removed from the target collection).  It will also
automatically reattach if the reference becomes valid again.  It
is still an error if a new reference is completely invalid (i.e.
the reference was never resolved a first time).  This still provides
early failure in the cases we want it and more flexibility in the
cases we don't.  However, do to other changes in the property system,
we could propably remove this requirement as well if it ever becomes
a problem.
if we ever
Fix texture coordinate compression when a coordinate was equal to 1.0.
Rename compressNormals -> compressVertices.