[OpenLayers-Trac] [OpenLayers] #3002: support tile extent for grid layers

[OpenLayers]

#3002: support tile extent for grid layers
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 Reporter:  tschaub     |       Owner:  elemoine    
     Type:  feature     |      Status:  new         
 Priority:  minor       |   Milestone:  2.11 Release
Component:  Layer.Grid  |     Version:  2.10        
 Keywords:              |       State:              
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 Layers that extend Grid base their tile lattice on the layer's maxExtent
 property.  In practice, the maxExtent of a layer corresponds to the data
 bounds or the map bounds imposed by the user.  Neither of these is
 necessarily coupled to the tile extent of a tile caching service.

 The [http://wiki.osgeo.org/wiki/WMS_Tiling_Client_Recommendation WMS-C]
 recommendation and other standards have the server advertise a tile
 extent.  It makes sense for OpenLayers to support a {{{tileExtent}}}
 property for gridded layers.

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Ticket URL: <http://trac.openlayers.org/ticket/3002>
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