Start v6
v6 line-offset -> line-gap-width
Render ⇢ layout, style ⇢ paint

https://github.com/mapbox/mapbox-gl-style-spec/issues/166
Add text-keep-upright tests
Single text positioning property

https://github.com/mapbox/mapbox-gl-style-spec/issues/197
Add text-rotate + text-anchor tests
Test compound text-anchor values
Restore local:// scheme

Want to keep the test suite protocol/host/port independent.
Merge branch 'v6'