Call goog.getUid in ol.Object constructor
Add renderOrder option to ol.layer.Vector
Respect renderOrder in ol.renderer.canvas.Vector
Optimize opacity clamping
Merge pull request #1888 from twpayne/draw-order

Optional fixed draw order
Merge pull request #1913 from fredj/heatmap-clamp

Optimize opacity clamping
Fix jsdoc
Restore ol.interaction.Select options
Remove stray option in modify-features example