add dependency on pyOpenSSL

setup.py

@@ -12,7 +12,7 @@ setup(
     license = "MIT",
     packages = find_packages(),
     platforms = ["any"],
-    install_requires = ["Flask", "itsdangerous"],
+    install_requires = ["pyOpenSSL", "Flask", "itsdangerous"],
     zip_safe = False,
     entry_points = {
         "console_scripts": [