Travis CI needs reactivating

[hugovk]

I can see the old builds: https://travis-ci.org/openid/python-openid/builds

But the CI needs reactivating:

https://travis-ci.org/openid/python-openid

[hugovk]

Norwegian blue: #62

Use python-openid2 instead:

• https://pypi.org/project/python-openid2
• https://github.com/ziima/python-openid