Move zeroPad function to BaseTypes and add tests for it
Modify classes which contained an internal numeric zero padding function to use the one in BaseTypes instead
Basic WCS testing in place.  Tests are basically meaningless at this point.
WCS testing more-or-less working, many tests failing, as expected
WCS 1.0.0 parsing now passing all tests
New tile image cache and tile queue improvements

We now reuse tile images by maintaining a cache of image elements with a
simplified LRU expiry policy (by order, not by timestamp). The tile queue
is bypassed for images that are available in the cache, so they can be
rendered immediately. And the tile queue itself loads more than just one
image at a time now (2 per layer url).
New TileManager

This removes all tile queueing/loading specific code from Layer.Grid
and creates a new class that manages tile loading and caching.
Adding destroy method, as suggested by @bartvde
Configure maps with TileManger instances (and not the other way around)

This resolves issues with destroying caches on window unload, and makes
cache sharing among maps less confusing to configure.
Adding API docs for the tileManager property
Updating tests
moveTimerId is no longer used
512 tiles is too much for some mobile browsers
Remove images from dom when replacing them with cached images
New beforeload event and slightly changed loading sequence

Having the TileManager remove an image from the DOM, then setting the
cached image, and then having to position it felt a bit awkward. With the
new beforeload event, the setImage method and putting renderTile before
positionTile, providing the cached image feels way more natural.
Enable fade-in for tiles from cache when we have a backbuffer
Recovering from merge conflicts
Better mousewheel/touchpad behavior for zooming

The navigation control gets better defaults, and the MouseWheel handler
gets a new maxDelta option, which can be used to avoid huge zoom level
jumps on heavy wheel/pad movements.
Use translate3d and translate where available.
Turn on GPU support for all children of the layerContainerDiv

This seems to remove all kinds of flicker and jumpiness, and to me it feels
also like it makes panning on slow mobile devices smoother.