Thumbnails can now be generated from the image files. 
They are accessible through the URLs as in the following examples:
http://localhost:8080/roda/admin/thumbnail/alias/login/h/100
http://localhost:8080/roda/admin/thumbnail/alias/login/h/100/w/150
http://localhost:8080/roda/admin/thumbnail/alias/login/x/200
http://localhost:8080/roda/admin/thumbnail/alias/login/y/300