Merge pull request #1193 from Lukasa/timeout_exception

Throw more informative exceptions.

requests/adapters.py

@@ -228,7 +228,7 @@ class HTTPAdapter(BaseAdapter):
             elif isinstance(e, TimeoutError):
                 raise Timeout(e)
             else:
-                raise Timeout('Request timed out.')
+                raise
 
         r = self.build_response(request, resp)