Added support for /friendships/lookup api call

tweepy/api.py

@@ -278,6 +278,19 @@ def me(self):
                           'target_id', 'target_screen_name']
     )
 
+
+    """ Perform bulk look up of friendships from user ID or screenname """
+    def lookup_friendships(self, user_ids=None, screen_names=None):
+	    return self._lookup_friendships(list_to_csv(user_ids), list_to_csv(screen_names))
+
+    _lookup_friendships = bind_api(
+        path = '/friendships/lookup.json',
+        payload_type = 'relationship', payload_list = True,
+        allowed_param = ['user_id', 'screen_name'],
+        require_auth = True
+    )
+
+
     """ friends/ids """
     friends_ids = bind_api(
         path = '/friends/ids.json',

tweepy/models.py

@@ -290,6 +290,17 @@ def parse(cls, api, json):
                 setattr(result, k, v)
         return result
 
+class Relationship(Model):
+    @classmethod
+    def parse(cls, api, json):
+        result = cls(api)
+        for k,v in json.items():
+            if k == 'connections':
+            	setattr(result, 'is_following', 'following' in v)
+                setattr(result, 'is_followed_by', 'followed_by' in v)
+            else:
+                setattr(result, k, v)
+        return result
 
 class JSONModel(Model):
 
@@ -323,6 +334,7 @@ class ModelFactory(object):
     search_result = SearchResult
     list = List
     relation = Relation
+    relationship = Relationship
 
     json = JSONModel
     ids = IDModel