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
Update notes/2.13.md
Use BaseTypes zeropad function in ArcGISCache tests
Merge pull request #626 from mpriour/zeropad

Consolidate numeric zero padding functions (r=@bartvde)
guard against null tileInfo
Default fallThrough to false

Default behaviour in OpenLayers 2.12 is to swallow events, even though the documentation says otherwise.
Update notes/2.13.md
Merge pull request #829 from bjornharrtell/fallThough

Default fallThrough to false
Clarifications on fallThorugh (see #829)
Merge pull request #832 from perrygeo/2.12-perrygeo

guard against null tileInfo
No .olTileReplacing class for singleTile layers

This fixes a regression for singleTile layers with transitionEffect set to
'resize', where the .olTileReplacing class was not removed from the tile.
After #829 fallThrough needs to be true for this test
Merge pull request #836 from ahocevar/replacing

No .olTileReplacing class for singleTile layers. r=@bartvde
Process queue immediately when params change

This fixes an issue where the queue would never be processed when a layer
is updated using mergeNewParams.
Merge pull request #839 from ahocevar/tilemanager-changelayer

Process queue immediately when params change. r=@bartvde
when cloning a layer that is loading, make sure numLoadingTiles is reset to 0 on the clone
Merge pull request #840 from bartvde/clone

when cloning a layer that is loading, make sure numLoadingTiles is reset...
Merge branch 'master' of https://github.com/openlayers/openlayers
Safeguard against listeners that recreate the grid

We need to handle the backbuffer before we fire the loadend event.
Otherwise listeners that call e.g. mergeNewParams() will cause the
backbuffer removal code to fail, because tile.imgDiv (and hence
this._transitionElement) will be null.