[OpenLayers-Trac] [OpenLayers] #2865: add an "Extend Cluster Strategy" example

[OpenLayers]

#2865: add an "Extend Cluster Strategy" example
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 Reporter:  erilem    |       Owner:              
     Type:  feature   |      Status:  new         
 Priority:  minor     |   Milestone:  2.11 Release
Component:  examples  |     Version:  SVN         
 Keywords:            |       State:              
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 Marc Jansen provided a great example demonstrating how to extend the
 cluster strategy. This ticket is about adding this example to trunk.

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Ticket URL: <http://trac.openlayers.org/ticket/2865>
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