HTTP GET rather than POST form.

This makes it easier to test since you can just reload an existing
URL.  It also makes it easier to link to.
Display useful information for publicKey; make lint.jade marginally prettier.
Be a little more clever extracting domain name from idp_url; redirect to actual query parameter.
Move linted domain earlier in page title.

This improves display in tabs, especially if you use vertical tabs.
Merge pull request #1 from ncalexan/master

Grab bag of small changes.

Thanks for the changes @ncalexan! They are fantastic!