- More tests
- More documentation
- Minor code cleanup

This should improve epub compatibility,
along with other formats as a side-effect

It's not mandatory to actually have a comment inside
comment delimiter, like `/**/`.

This should close #95.

without /etc/ld.so.cache available in the sandbox, tests fail on gentoo with:
/usr/bin/ffmpeg: error while loading shared libraries: libstdc++.so.6:
    cannot open shared object file: No such file or directory

This should make easier to get more metadata from
archive-based file formats.

intrigeri authored Feb 03, 2019 and jvoisin committed Feb 03, 2019

This should closes  #90

This should solve collisions with people like me that
are copy/pasting the documentation, creating conflicts
with other extensions that are doing the very same thing.

Kudos to Sherry Taylor for reporting this issue ♥