Ignore Django deprecation warnings

This is just a temporary fix, should be implemented in some better way.
Refactor structure of test files

Since we have fixtures related to tests, it is better to put everything in one
place.

Also `test_data` sound ugly.. :)
At least check if directory exists

Now, tests did not nested anything, so fixed it to at least test if directory
exists.
Some code for import_news function

Not yet finished, just early stage.