Backend: Try different demo link
Backend: Keep on loading even when demo cleanup fails
Demo: Self-Host images
Merge
Merge branch 'master' of https://github.com/silverwind/droppy

* 'master' of https://github.com/silverwind/droppy:
  Frontend: Update icons, add 16x16 and 32x32 pngs
  Demo: Self-Host images, fix #207
Backend: Use a single disposition header for downloads