Added glowing Polylines.
Merge remote-tracking branch 'origin/master' into glowingLines
Merge remote-tracking branch 'origin/master' into glowingLines
Switched to non-linear glow, per @pjcozzi suggestion, and simplified the code.
Cull polyline if width is less than 1.0.
Move polyline bounding sphere to surface in 2D to prevent incorrect culling by the near plane.
Minor license wording tweaks
Ignore polylines with less than 2 points.

Previously the check for polyline length happened in `PolylineBucket.prototype.getPolylinePositionsLength`, but this is too late in some circumstance and causes us to index out of bounds of the position array.  This showed up with #706. We now check for length > 1 in sortPolylinesIntoBuckets, which occurs much earlier in the pipeline

I also removed a bunch of unecessary color parameters from the unit tests.
Merge pull request #712 from AnalyticalGraphicsInc/onePointLines

Ignore polylines with less than 2 points.
Reproject imagery in the vertex shader instead of FS.

This avoids fragment shader precision problems in mobile devices.
Merge pull request #713 from AnalyticalGraphicsInc/license

Trivial LICENSE.md updates
Fix Sandcastle ThirdParty exclusion in project preferences.
Removed pointMC
Merge pull request #717 from AnalyticalGraphicsInc/positionMC

Removed positionMC from czm_materialInput.
Update CHANGES.md.
Merge pull request #683 from AnalyticalGraphicsInc/glowingLines

Added glowing Polylines.
Bump the version to b16 in advance of the upcoming release.
Slight optimization, and comment explaining approach.
Updates based on review.
Fix my failure to increment properly.