WIP: Preview for PSD files.

Timo Uhlmannrequested to merge
amiuhle/gitlab-ce:13189-psd-preview into master

Adresses #13189 (moved)

TODOs

  • Specs
    • Gitlab::Preview
    • PreviewCacheWorker
    • Blob
  • Delete generated previews when
    • A branch is deleted
    • The project is deleted
  • Handle large preview files. (Gitlab.config.previews.max_size?)
  • Move settings to admin section

Merge request reports