Initial python3 changes

Mostly just updating libraries, removing string encoding/decoding,
fixing some edge cases. No new functionality was added in this
commit.

lib/confuse/__init__.py

@@ -0,0 +1,13 @@
+"""Painless YAML configuration.
+"""
+
+from __future__ import division, absolute_import, print_function
+
+__version__ = '1.7.0'
+
+from .exceptions import * # NOQA
+from .util import * # NOQA
+from .yaml_util import * # NOQA
+from .sources import * # NOQA
+from .templates import * # NOQA
+from .core import * # NOQA