Stage 1 conversion to JSON for storing Credentials.

Reviewed in http://codereview.appspot.com/4972065/
diff --git a/apiclient/model.py b/apiclient/model.py
index 7f51d29..b8271f9 100644
--- a/apiclient/model.py
+++ b/apiclient/model.py
@@ -222,7 +222,8 @@
     _abstract()
 
   def deserialize(self, content):
-    """Perform the actual deserialization from response string to Python object.
+    """Perform the actual deserialization from response string to Python
+    object.
 
     Args:
       content: string, the body of the HTTP response
@@ -285,8 +286,8 @@
     de-serialized using the given protocol buffer class.
 
     Args:
-      protocol_buffer: The protocol buffer class used to de-serialize a response
-          from the API.
+      protocol_buffer: The protocol buffer class used to de-serialize a
+      response from the API.
     """
     self._protocol_buffer = protocol_buffer