gnome-epub-thumbnailer-1.5-bp151.3.1

- Run spec-cleaner, modernize spec, use autosetup macro.
- Update URL and Source to current home.

- Update to version 1.5:
  + Fix MOBI crasher with malformed or missing EXTH header.
  + Fix EPub thumbnailing with cover at the root of the archive.

- Update to version 1.4:
  + Create covers for encrypted MOBI files as well.
  + Fix crash when there's no cover in MOBI files.
  + Fix crash when the EPub cover cannot be found.
  + Print warnings when we cannot find the metafile, or when
    reading empty EPub files.
  + Fix crash handling files in trash or recent locations.

- Update to version 1.3:
  + Fix a number of possible crashers in the MOBI thumbnailer.
- Changes from version 1.2:
  + Added MOBI thumbnailer.

- Update to version 1.1:
  + Fix possible crashes or excessive warnings on failure.

- Initial package, version 1.0.