Rename line-offset to line-gap-width, align case to outside
Update style-spec
Parse default color values

This is necessitated by https://github.com/mapbox/mapbox-gl-style-spec/commit/aada97954e65b40398bb90b7ce149fafb51df8b7
Use feature-filter
v6: Rename min-zoom -> minzoom, max-zoom -> maxzoom.
feature-filter 1.0.0
Render ⇢ layout, style ⇢ paint

https://github.com/mapbox/mapbox-gl-style-spec/issues/166
Add test-suite script
Single text positioning property

https://github.com/mapbox/mapbox-gl-style-spec/issues/197
Support compound text-anchor values
Use released style-spec