support cert auth when talking to the API

apypie/api.py

@@ -38,6 +38,8 @@ class Api(object):
     :param uri: base URL of the server
     :param username: username to access the API
     :param password: password to access the API
+    :param client_cert: client cert to access the API
+    :param client_key: client key to access the API
     :param api_version: version of the API. Defaults to `1`
     :param language: prefered locale for the API description
     :param apidoc_cache_base_dir: base directory for building apidoc_cache_dir. Defaults to `~/.cache/apipie_bindings`.
@@ -80,6 +82,9 @@ def __init__(self, **kwargs):
         if kwargs.get('username') and kwargs.get('password'):
             self._session.auth = (kwargs['username'], kwargs['password'])
 
+        if kwargs.get('client_cert') and kwargs.get('client_key'):
+            self._session.cert = (kwargs['client_cert'], kwargs['client_key'])
+
         self._apidoc = None
 
     @property