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
Merge branch 'master' into default