fixed typo in io.py

python/caffe/io.py

@@ -46,7 +46,7 @@ def array_to_blobproto(arr, diff=None):
     return blob
 
 
-def arraylist_to_blobprotovecor_str(arraylist):
+def arraylist_to_blobprotovector_str(arraylist):
     """Converts a list of arrays to a serialized blobprotovec, which could be
     then passed to a network for processing.
     """