Updated SPONSORS with latest donors

git-svn-id: http://svn.osgeo.org/qgis/trunk@6044 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: gsherman

SPONSORS

@@ -8,6 +8,9 @@
 # name|<website>
 # New sponsors should be added to the *top* of the list. The
 # website entry is optional.
+Luca Casagrande 
+David Enns|www.mapitout.com
+Alexandre Leroux
 Stefano Menegon|www.mpasol.it
 Maciej Sieczka
 Jason Jorgenson