Guess which presenter to use based on URL

[KrzysztofMadejski]

Some hints / code how to do it:

• based on url string: https://github.com/DanePubliczneGovPl/ckanext-archiver/blob/danepubliczne/ckanext/archiver/tasks.py#L279
• based on actual GET (should be changed to HEADERS/OPTIONS): https://github.com/DanePubliczneGovPl/ckanext-archiver/blob/danepubliczne/ckanext/archiver/tasks.py#L448 (I wouldn't implement it at this point, but we can keep it in comments for future reference)

[KrzysztofMadejski]

Most datasets/campaigns will have only one document type so we won't need guessing, just defining which presenter should be used #120