[fix] gigablast https + url params

searx/engines/gigablast.py

 """
  Gigablast (Web)
 
- @website     http://gigablast.com
- @provide-api yes (http://gigablast.com/api.html)
+ @website     https://gigablast.com
+ @provide-api yes (https://gigablast.com/api.html)
 
  @using-api   yes
  @results     XML
 number_of_results = 5
 
 # search-url, invalid HTTPS certificate
-base_url = 'http://gigablast.com/'
-search_string = 'search?{query}&n={number_of_results}&s={offset}&xml=1&qh=0&uxid={uxid}&rand={rand}'
+base_url = 'https://gigablast.com/'
+search_string = 'search?{query}&n={number_of_results}&s={offset}&format=xml&qh=0&rxiyd={rxiyd}&rand={rand}'
 
 # specific xpath variables
 results_xpath = '//response//result'
         query=urlencode({'q': query}),
         offset=offset,
         number_of_results=number_of_results,
-        uxid=randint(10000, 10000000),
+        rxiyd=randint(10000, 10000000),
         rand=int(time()))
 
     params['url'] = base_url + search_path