Making sure the correct buttons are shown when appropriate, smoothing out jumps.

issue #276

BrowserIDIdentities has the added advantage of adding the correct classname to the body.

This does no syncing if the user is authenticated.

Changing the signIn button in about.ejs from a button to an anchor.

Since we are autofocusing input elements, it gives a poor user experience because the text flashes.

fix issue where hash changes during dialog interaction would break things.  extract relay frame id from hash at load time.  closes #295

fix issue where hash changes during dialog interaction would break things.  extract relay frame id from hash at load time.  closes #295

improve documentation of changes to window opening to deal with firefox bugs and code loading race conditions

use onready instead of polling to fix race condition related to window vs relay frame readiness, and fix problems in FFX with re-attaching iframes of the same name, by creating relay frames with unique names every time.

issue #287 & issue #286

Every time we create a relay frame, give it a new name.

issue #287.

channel.js - check to see if the relay frame and the necessary functions are ready before t

include.js - open the iframe before the window.

Right now making it its own dialog, not sure if this is correct or not yet.

Only showing the button if the user is actually authenticated.