pin backbone to version 1.2.3 to keep compatible with backbone.wreqr
pin backbone to version 1.2.3 to keep compatible with backbone.wreqr

scalableminds/webknossos,scalableminds/webknossos,scalableminds/webknossos,scalableminds/webknossos,scalableminds/webknossos,scalableminds/webknossos