engines: use https when possible

searx/engines/bing_images.py

 # search-url
 base_url = 'https://www.bing.com/'
 search_string = 'images/search?{query}&count=10&first={offset}'
-thumb_url = "http://ts1.mm.bing.net/th?id={ihk}"
+thumb_url = "http://ts1.mm.bing.net/th?id={ihk}" # no https, bad certificate
 
 # safesearch definitions
 safesearch_types = {2: 'STRICT',

searx/engines/currency_convert.py

 import re
 
 categories = []
-url = 'http://finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s={query}=X'
+url = 'https://download.finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s={query}=X'
 weight = 100
 
 parser_re = re.compile(r'^\W*(\d+(?:\.\d+)?)\W*([a-z]{3})\W*(?:in)?\W*([a-z]{3})\W*$', re.I)  # noqa
     )
 
     now_date = datetime.now().strftime('%Y%m%d')
-    url = 'http://finance.yahoo.com/currency/converter-results/{0}/{1}-{2}-to-{3}.html'  # noqa
+    url = 'https://finance.yahoo.com/currency/converter-results/{0}/{1}-{2}-to-{3}.html'  # noqa
     url = url.format(
         now_date,
         resp.search_params['ammount'],

searx/engines/deezer.py

 paging = True
 
 # search-url
-url = 'http://api.deezer.com/'
+url = 'https://api.deezer.com/'
 search_url = url + 'search?{query}&index={offset}'
 
 embedded_url = '<iframe scrolling="no" frameborder="0" allowTransparency="true" ' +\
-    'data-src="http://www.deezer.com/plugins/player?type=tracks&id={audioid}" ' +\
+    'data-src="https://www.deezer.com/plugins/player?type=tracks&id={audioid}" ' +\
     'width="540" height="80"></iframe>'
 
 

searx/engines/mixcloud.py

 paging = True
 
 # search-url
-url = 'http://api.mixcloud.com/'
+url = 'https://api.mixcloud.com/'
 search_url = url + 'search/?{query}&type=cloudcast&limit=10&offset={offset}'
 
 embedded_url = '<iframe scrolling="no" frameborder="0" allowTransparency="true" ' +\

searx/engines/stackoverflow.py

 paging = True
 
 # search-url
-url = 'http://stackoverflow.com/'
+url = 'https://stackoverflow.com/'
 search_url = url+'search?{query}&page={pageno}'
 
 # specific xpath variables

searx/engines/vimeo.py

 paging = True
 
 # search-url
-base_url = 'http://vimeo.com'
+base_url = 'https://vimeo.com'
 search_url = base_url + '/search/page:{pageno}?{query}'
 
 # specific xpath variables