Display metadata from files embedded in office documents

Currently, mat2 isn't displaying the metadata from embedded files in office documents. Currently, it's only showing the metadata of the archive, handled in a flat dict.

I think that we might use a nested dict structure to handle this:

{'my_file.docx':
  'author': 'jvoisin',
  'my_picture.png': {
    'producer': 'the GIMP'
  },
  'creation_date': 'yesterday'
}

Or a flat dict, with prefixes:

{'author': 'jvoisin',
 '(my_picture) producer': 'the GIMP',
 'creation_date': 'yesterday'
}

But I'm open to other suggestions :)

changed the description

I wasn't thinking really like this, but like that :

• You have a file and a dict corresponding to its metadata
• You have files inside the parents file and a different dict for them

I have to admit, your nested solution makes sense.

assigned to @smagnin

changed milestone to %0.5.0 - Slug

Partially implemented in 35dca4bf by @smagnin

Done in 513d897e

closed

assigned to @jvoisin and unassigned @smagnin

changed milestone to %0.6.0 - Sloth