check for empty thumbnail object store
insert image type check.
implemented the beautiful thumbnail service
fixed EFG Download plugin and decreased the number of threads for generation of thumbnails
fixed WF OAI
fixed all workflows
fixed bug
added light-ui
Added Patch
ProgressProvider method renamed
Added counter to GenerateThumbanil Job node
implemented generation of thumbnail
fixed download into gridfs
rename of packages and classes
progress provider refactoring
added backlink implementation
added standard maven folder