cli: fix pep8 formatting
stun: pep8 cleanup
stun: fix UnboundLocalError in get_nat_type

closes #1
closes #4
Handling get address info error.

Conflicts:
	stun/__init__.py

closes #2
stun: remove dead hosts from stun server list
add version info to stun module and stun.cli
bump version to 0.0.3
README: update pystun --help output
README: add changelog for 0.0.3 release
Merge branch 'release-0.0.3' into develop
Merge remote-tracking branch 'origin/develop' into python3

Conflicts:
	stun/__init__.py