bumped to v1.3

Signed-off-by: Rolf Håvard Blindheim <rolf@moota.com>
moved gviz tests to tests module and inherits from django.test.TestCase instead of unittest

Signed-off-by: Rolf Håvard Blindheim <rolf@moota.com>
started py3 compatibility

Signed-off-by: Rolf Håvard Blindheim <rolf@moota.com>