Examine and improve cache clearing for CPTs

[cjyabraham]

For example, the case study listing page should have its cache cleared when a new case study is published.

I assume that the blog post listing and homepage have their cache cleared when a new blog post is published but we should double-check.

Pantheon has a way of selectively clearing certain pages when a content type is updated. Read about "surrogate keys" in the Advanced Page Cache plugin.