Added addWellKnownGraphic to OpenLayers

To fix this issue :
https://plus.google.com/109469282093237430914/posts/362dRyCYe2X
Added well known graphics example to showcase
Implemented setLayers method on SelectFeature control
Some Improvements
Enhanced AnimedClusterWithPopupExample

Now each feature has an int attribute, when clicking on a clustered
feature, all the sum of these int attributes is displayed in the popup
GWT.log cleanup
Upgraded for superdevmode
Merge branch 'master' of https://github.com/geosdi/GWT-OpenLayers

# By Frank Wynants (6) and Giuseppe La Scaleia (1)
# Via Frank Wynants
* 'master' of https://github.com/geosdi/GWT-OpenLayers:
  Upgraded for superdevmode
  GWT.log cleanup
  Enhanced AnimedClusterWithPopupExample
  Some Improvements
  Implemented setLayers method on SelectFeature control
  Added well known graphics example to showcase
  Added addWellKnownGraphic to OpenLayers