Add 'requests' library to third_party.

third_party/requests/certs.py

+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+certs.py
+~~~~~~~~
+
+This module returns the preferred default CA certificate bundle.
+
+If you are packaging Requests, e.g., for a Linux distribution or a managed
+environment, you can change the definition of where() to return a separately
+packaged CA bundle.
+"""
+
+import os.path
+
+
+def where():
+    """Return the preferred certificate bundle."""
+    # vendored bundle inside Requests
+    return os.path.join(os.path.dirname(__file__), 'cacert.pem')
+
+if __name__ == '__main__':
+    print(where())