Conflicts:
	searx/tests/test_engines.py

add 1x.com engine, improve yacy-engine

* Deacivated by default, because of the big amount of results

[fix] hash error if url is including non ascii characters

XPath *never* return None.

(I found the HTML report of coverage)

[fix] btdigg

Change the cookie in bing_news to use the english interface

But still uses the language to set the market, and so provide relevant results to the language.
Fix #198