fixed the base64 incompat.
more bytestrings

this time there was the need to change some tests from
	str(caselessdict) == CaselessDict"{u'foo': u'bar'}"
to
	assert isinstance(caselessdict, CaselessDict)
	caselessdict == {u'foo': u'bar'}

down to 2 and a half (one is wobbly) failed tests in python3.3