not all files are metadata.xml !
added gzipped filename
cleanup
added bundler dependency support and test uploaded gem to have the right filename (enforce consistency)
* use bundler depencencies for pseudo filesystem api/v1/depdencenies?gem=...

* fix gems wth capital letter in gemname

* added helper in rubgems-facade to decide which files can be deleted via GUI or not
just a different order of downloadning
* added more asserts which can be overwritten by the various typessubclasses

* added asserts for using bundler dependency API