Kinetic dragging by default
Resize transitions by default
As the comments mention, this assumes null transitionEffect
Merge pull request #883 from tschaub/nicer-defaults

Setting `transitionEffect: "resize"` by default for `OpenLayers.Layer.Grid`.  Setting `enableKinetic: true` for `OpenLayers.Control.DragPan`.
Adding ZoomBox and OSM fallback layer

Using the new defaults, we don't need to pass options to the Navigation
control anymore. As a side effect, we get ZoomBox, but need to add css for
it to work properly. For users outside Vienna, an OSM fallback layer was
added which gets activated when the viewport does not intersect Vienna.
Remove osm layer when back in Vienna

Thanks @tschaub for this suggestion.
Update MapQuest tile URL templates
Chasing tiles
Overriding createBackBuffer in UTFGrid layer

This layer doesn't need to create a backbuffer.
Test that createBackBuffer doesn't fail
Test clean up
Merge pull request #890 from tschaub/utfgrid-backbuffer

Override createBackBuffer in UTFGrid layer.