Release.
Update cocaine-framework-python-bf.spec
Change  array to bytearray in Readable stream, because

new msgpack.Unpacker (>= 0.4) requires object with "new" buffer API for feeding.
Changelog fix.
Python 2.6 backward compatibility.

Python 2.6 raises `TypeError` when `bytearray` is passed into `recv_into` socket method. So I've done wrapper over `array.array` and `bytestream` classes that will be loaded depending on current Python version.
Fix debianization.
Fix debianization