Fix SSL verification

This fixes UrlRequest creating a context even for http connection.

Author: rmagatti

kivy/network/urlrequest.py

@@ -272,7 +272,7 @@ def _fetch_url(http://github.com/self,%20url,%20body,%20headers,%20q):
             ctx.verify_mode = ssl.CERT_REQUIRED
             args['context'] = ctx
 
-        if not verify:
+        if not verify and parse.scheme == 'https':
             ctx = ssl.create_default_context()
             ctx.check_hostname = False
             ctx.verify_mode = ssl.CERT_NONE