[Python-3000] Last call for PEP 3137: Immutable Bytes and Mutable Buffer

[Travis Oliphant]

+1 from me.

I like that the str will not support the buffer API because it gets rid 
of one of the flags in the PEP 3118 API that was only there to support 
the abuse of the buffer API by unicode objects.

- Travis Oliphant