"Subscribe to URL" input box should accept plain domains

[tantek]

Typing in "tantek.com" should "just work" in the "Subscribe to URL" input box.

Right now it doesn't. It gives you an error that says "Please enter a URL".

Not user friendly, and also solved with a small bit of Javascript.

See the URL input box on tantek.com/relmeauth (nevermind the SSL error if any) and the Javascript that makes that work.

(Aside: I really need to extract that bit of JS into a snippet/gist/library to make this easier, but at least that ^^^ is a starting point!)