BAZYNGO-1321: attachemnt_images_max_size configuration option for
ProposeDocument module
BAZYNGO-1318: added org.imgscalr:imgscalr-lib dependency
BAZYNGO-1323: resize uploaded images to configured size
BAZYNGO-1322: do not resize images uploaded by the administrators
BAZYNGO-1323: scale images down only. Enlarging smaller images would
have been rather unproductive :)