More fixes (Travis again).

forfuckssaketravisnotagain

searx/engines/wolframalpha_api.py

 
 from urllib import urlencode
 from lxml import etree
-from searx.engines.xpath import extract_text
-from searx.utils import html_to_text
 
 # search-url
 base_url = 'http://api.wolframalpha.com/v2/query'