Download all works to sqlite3

[Data Examples](http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=++++++++PREFIX+dbpedia-owl%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0A++++++++PREFIX+dbpprop%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fproperty%2F%3E%0D%0A++++++++SELECT+DISTINCT+%0D%0A++++++++++++STRAFTER%28+STR%28%3Fwork%29%2C+%22http%3A%2F%2Fdbpedia.org%2Fresource%2F%22%29+as+%3Fwork%0D%0A++++++++++++%28group_concat%28STRAFTER%28+STR%28%3Fauthor%29%2C+%22http%3A%2F%2Fdbpedia.org%2Fresource%2F%22%29+%3B+SEPARATOR%3D%22%2C+%22%29+as+%3Fauthor%29%0D%0A++++++++WHERE+%7B%0D%0A++++++++++++%3Fwork+%3Fp+%3Fauthor%0D%0A++++++++FILTER%28%0D%0A++++++++++++%28+%3Fp+%3D+dbpprop%3Aauthor+%7C%7C+%3Fp+%3D+dbpedia-owl%3Aauthor+%7C%7C+%3Fp+%3D+dbpedia-owl%3Awriter+%29+%0D%0A++++++++++++%26%26+STRSTARTS%28STR%28%3Fwork%29%2C+%22http%3A%2F%2Fdbpedia.org%2F%22%29%29+%0D%0A++++++++%7D%0D%0A++++++++GROUP+BY+%3Fwork%0D%0A++++++++LIMIT+10&format=text%2Fhtml&timeout=30000&debug=on)

This code will download all artists in [DBpedia](http://dbpedia.org), and the schema will be same as *Data Examples*.
If there are more than one authors in a work, the authors will be appended in the same row, there will be *,* between authors.


Wait, why is the `conftest.py` here, not `tests/`?