Add get_member_types() method for CORE API

corepos/api.py

@@ -132,6 +132,22 @@ class CoreWebAPI(object):
         assert set(js['result'].keys()) == set(['result'])
         return js['result']['result']
 
+    def get_member_types(self):
+        """
+        Fetch all Member Type records from CORE.
+
+        :returns: A (potentially empty) list of member type dict records.
+        """
+        params = {
+            'entity': 'Memtype',
+            'submethod': 'get',
+            'columns': {},
+        }
+
+        response = self.post(params)
+        result = self.parse_response(response)
+        return [json.loads(rec) for rec in result]
+
     def get_members(self):
         """
         Fetch all Member records from CORE.