api: Add default protocol for localhost.

Add default "http://" to site argument locally if it is not specified
in an api call.

This fixes a problem where if you didn't manually specify `http://`
when connecting to a development server, the API bindings would hang
trying to connect using HTTPS.

zulip/__init__.py

@@ -213,7 +213,9 @@ class Client(object):
         self.email = email
         self.verbose = verbose
         if site is not None:
-            if not site.startswith("http"):
+            if site.startswith("localhost"):
+                site = "http://" + site
+            elif not site.startswith("http"):
                 site = "https://" + site
             # Remove trailing "/"s from site to simplify the below logic for adding "/api"
             site = site.rstrip("/")