APHAScraper does not work for Emerald

[Robert Jäschke]

http://www.emeraldinsight.com/doi/abs/10.1108/S1876-0562%282004%290000004009

does currently not work (probably referer or postData not sufficient)

Also: please adaopt name/description of Scraper

[Robert Jäschke]

This scraper is related to issue #2815.

[Robert Jäschke]

Now moved to separate EmeraldScraper, which does not work since the server sends a 302 redirect response for the POST request and the HttpClient does not support following redirects for POST requests. Needs to be handled by manually implementing the request handling using the HttpClient directly.