Pay the debt again.

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Added a couple of extensions that must not be filtered.

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Fix #251

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Add documentation about #251

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>