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

Conflicts:
	browserid/static/dialog/resources/browserid-identities.js

In dialog_controller, using this call instead of the manual calls to BrowserIDNetwork.logout and BrowserIDStorage.clearEmails

Adding cancelUser to browserid-identities and removing the work to sync emails from BrowserIDNetwork.

Also updated the globals declarations at the top of all the files to only declare the ones actually used for that file.

Since the relay is only two files, right now in compress.sh concatinating just those two files.

issue #265