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I think this should close #21. On the other hand, it says "this video is not
available in your region", so I am not sure this actually works.

Adds filters on the MIME type checks when uploading files.

Currently it allows to upload text files containing GPG/PGP keys.
It closes issue noblogs-composer#30

In the future we might need to add other filters.

see noblogs-composer#26

PHP prefers/requires function names to be quoted when passed as arguments

This reverts commit 483610dd