Serialize and Deserialize unicode (#349)

lib/python/ray/serialization.py

@@ -28,6 +28,9 @@ class Tuple(tuple):
 
 class Str(str):
   pass
+  
+class Unicode(unicode):
+  pass
 
 class NDArray(np.ndarray):
   pass

lib/python/ray/worker.py

@@ -489,6 +489,8 @@ class Worker(object):
       result = serialization.Tuple(result)
     elif isinstance(result, str):
       result = serialization.Str(result)
+    elif isinstance(result, unicode):
+      result = serialization.Unicode(result)
     elif isinstance(result, np.ndarray):
       result = result.view(serialization.NDArray)
     elif isinstance(result, np.generic):