Just use urlparse.urljoin
Just use urlparse.urljoin

The path locality check was reversed, so ``urlparse.urljoin`` was being
used for local paths, and remote URIs were not working at all because
``os.path.join`` was being used for them. Just use ``urlparse.urljoin``.

okfn/datapackage-model-py,datapackages/datapackage-py,okfn/datapackage-py,sirex/datapackage-py,datapackages/datapackage-py,okfn/datapackage-model-py,okfn/datapackage-py,sirex/datapackage-py