Redis: Use super._restore when ack_emulation disabled.  Closes celery/celery#1776
Adds CI for Py3.4
parse_url function should not know about mongodb, and the transport already sets can_parse_url
Adds sanitize_url and as_url to kombu.utils.url

Conflicts:
	kombu/utils/url.py
Adds maybe_sanitize_url to kombu.utils.url

Conflicts:
	kombu/utils/url.py
Tests passing
sanitize_url now works if host is None
Fixes typo in comment
kombu[librabbitmq] now depends on librabbitmq 1.5.2