Switch to bytes and str to pass all tests on Python 3.3.1.

Cython 0.19 is a huge help in 2/3 compatibility.
Vary test fixtures slightly for 2/3, depend on six.

Fiona is now 2/3 compatible in the same distribution.
Merge branch 'py33'

Conflicts:
	setup.py
	src/fiona/__init__.py
	src/fiona/ogrext.pyx
Properly encode options and update change log.