Bytes Iterator for Buffer

[mmstick]

If you wouldn't mind, I'd like to see a bytes() iterator for the Buffer structure. Perhaps even a to_string() and as_bytes() method too. Basically, when writing data to an output, it needs to be in a raw &[u8] format.

[MovingtoMars]

I'll probably implement this tomorrow if no-one else gets there first.

[MovingtoMars]

57ea1d0 should do most of what you're looking for.

(Buffer already has to_string() as it implements std::fmt::Display)