GAE Blobstore: GetBlobServlet: return HTTP 404 NotFound when unknown key is specified, instead of HTTP 504 InternalServerError
 Configure away the normal ASDF source registry, so we only use Quicklisp. (asdf:initialize-source-registry `(:source-registry :ignore-inherited-configuration))
run-agent.sample.lisp - suggest to not use CCL as test-grid-agent:preferred-lisp until quicklisp issue https://github.com/quicklisp/quicklisp-client/issues/71 is resolved