Add CLIP model, minor fixes, and test Github Actions for publishing releases

First release in a while, mostly just to establish our systems are set up for publishing new releases of lucid again. It's possible this release will fail to publish at first; please bear with me as I experiment with Github Actions.

v0.3.9-alpha

Minor cleanups preparing for a patch releaase

v0.3.8

Release v0.3.8

v0.3.7

Release v0.3.7

v0.3.6

Version 0.3.6

v0.3.4

Version 0.3.4

v0.3.1

Merge branch 'master' of github.com:tensorflow/lucid

v0.3

v0.3 - now with many models

v0.2.3

Move explicit tensorflow dependency from CI config to tox config

v0.1.0

Merge branch 'master' of github.com:tensorflow/lucid