implemented list csar service, fixes #22
fix FileSystem refs #44
Merge pull request #43 from przytads/22

implemented list csar service, fixes #22
Merge pull request #47 from eiselems/44

fix FileSystem refs #44
Reimplemented DownloadService, refs #20
Merge pull request #48 from TKosch/20

Reimplemented DownloadService, fixes #20