Don't scale the text stroke width by pixel ratio
Add "None" to draw-features example's select

This allows to deactivate drawing entirely in the example.
Correct minor typo in tasks/readme
Stop exporting getTransformFromProjections and transformWithProjections
Merge pull request #2212 from elemoine/drawinteraction

Add "None" to draw-features example's select
Merge pull request #2213 from probins/patch-1

Correct minor typo in tasks/readme
Add tilePixelRatio option to ol.source.Tile
Add tilePixelRatio option to ol.source.TileImage
Add tilePixelRatio option to ol.source.WMTS
Add example
Use tilePixelOption in wmts-hidpi example
Correct code type in tasks/readme
Merge pull request #2215 from fredj/json-type

Correct code type in tasks/readme
Add an offset property to ol.Overlay

Replaces "offsetX" and "offsetY" by an ol.Object "offset" property.
Merge pull request #2214 from probins/patch-2

Stop exporting getTransformFromProjections and transformWithProjections
Allow the value to be changed while iterating over the rtree
Remove the unused popup from the synthetic-points example
Add docs for tilePixelRatio
Merge pull request #2216 from elemoine/pixelratio

Add tilePixelRatio option to ol.source.WMTS
Merge pull request #2220 from fredj/synthetic-points-popup

Remove the unused popup from the synthetic-points example