add year filter to engines with time range support && tests

Following engines does not support "Last year":
 * Bing News
 * DeviantArt
 * DuckDuckGo
 * Yahoo
 * YouTube (noapi)

searx/engines/yahoo.py

@@ -77,6 +77,9 @@ def _get_language(params):
 
 # do search-request
 def request(query, params):
+    if params['time_range'] and params['time_range'] not in time_range_dict:
+        return params
+
     offset = (params['pageno'] - 1) * 10 + 1
     language = _get_language(params)