Also made the Travis build ensure that no warnings
are present.
These builds were previously spewing many warnings,
which was hiding warnings for important things like
accidentally using C++11-only features.
Change-Id: I56caeee9db48bc78756a3e8d7c14874630627037
1, objcect_pair_hook is not supported in python2.6, so duplicated key check is removed in 2.6
2, total_seconds is not suppoted in python2.6, changed to compute seconds directly
Fixes the ScalarMapContainer/MessageMapContainer implementations on
Python 3.4, by dynamically allocating their PyTypeObjects using
PyType_FromSpecWithBases, instead of statically allocating them. This is
necessary because Python 3.4+ disallows statically allocating a class
with a dynamically allocated parent.
Signed-off-by: Dan O'Reilly <oreilldf@gmail.com>