Add 2D transform abstraction
Refactor DOM renderer to use only CSS transforms
Move forEachReadyVisibleLayer into WebGL renderer
Add option to round transformation matrix values
Round transformation values to six decimal places
Factor out ImageTile and ImageTileSource
Add ol.source.DebugTileSource
Add canvas tiles example
Merge pull request #98 from twpayne/pure-transform-dom-renderer

Pure transform DOM renderer
Merge pull request #99 from twpayne/beyond-image-tiles

Beyond image tiles
Implement frame state and animation architecture
Add animation examples to side-by-side demo
Register post-render functions instead of using an event
Flag 2D-specific code, thanks @elemoine
Merge pull request #102 from twpayne/frame-state

Frame state