Add ol.structs.IntegerSet
Refactor ol.structs.IntegerSet to use a packed array
Add initial ol.structs.Buffer
Add ol.structs.IntegerSet.toString
Extend equalArray to consider NaNs to be equal
Replace unused entries with NaNs
Reverse order of arguments to set and s/index/offset/
Allow rectangles to be empty
Add ol.Rectangle.isEmpty
Add ol.Extent.createEmptyExtent
Add ol.Rectangle.extendXY
Add missing variable declaration
Remove unused function
Promote texture and framebuffer management into base class
Add ol.math.roundUpToPowerOfTwo
Use ol.math.roundUpToPowerOfTwo
Add ol.renderer.webgl.Layer.getWebGLMapRenderer

This improves the type checking.
Manage buffers in WebGL map renderer
Promote projectionMatrix and texCoordMatrix into base class
Use local variable for texCoordMatrix