Extractor get published date function modification

[AndyTheFactory]

Issue by vashis Thu May 17 09:53:00 2018 Originally opened as https://github.com/codelucas/newspaper/issues/567

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Since that function takes date from the url first and later from the described tags from the xpath. Its giving wrong date.

You can check with this example url http://www.newsweek.com/2018/05/18/navy-seals-seal-team-6-left-behind-die-operation-anaconda-slabinski-chapman-912343.html

My suggestion is switch the two methods. Get date first from the tags/attributes and then from the url.