cache_explain 1.0.0-alpha1

Do not use this release. Install 1.0.0-alpha2 instead.

In this release, js/cache_explain.js contains uppercase TRUE, FALSE and NULL, which aren't valid JavaScript. The script stops with
ReferenceError: FALSE is not defined, so the Cache Explain block renders nothing. The PHP is unaffected, but without the script the panel can't appear. 1.0.0-alpha2 fixes this
and makes no other changes.

This was the first tagged release of Cache Explain, a block that shows whether each caching layer (browser, Cloudflare or Akamai, Varnish, and Drupal's page caches) served the current
page, and why. For the full feature list, see the 1.0.0-alpha2 release notes.