happiness script's url check should follow redirects before trying to validate content

[dllh]

Repro:

happiness url http://some-url-that-redirects/

Expected: It'll fetch the headers, then follow the redirect to display info about Jetpack, etc.

Actual: It just shows empty info about the url because the redirect has no content for the script to parse the response from.

[dllh]

Workaround until this is fixed: See what the Location header is and specify that url to the script instead.