Adding labels, using more semantic markup.

issue #92

basic testing of all db.js apis complete, also completed implementation of identitysync to check installed pubkeys.

Can select buttons using the email address.
Can move through the email addresses and buttons using the tab/arrow keys.

close #86

In the steal build script, do concat only, then use YUI compression from compress.sh to do the actual compression.

(resolved) Conflicts:
	browserid/lib/db.js
	browserid/lib/wsapi.js

(resolved) Conflicts:
	README.md
	browserid/lib/wsapi.js

(resolved) Conflicts:
	browserid/app.js

consolidate db.checkAuth and db.checkAuthHash - move all bcrypt knowledge out of the persistence layer

tests of db.isStaged, db.stageEmail, db.gotVerificationSecret, and db.emailKnown.  also add some documentation in db.js for various apis

initial stubbing of db.js tests, also generalize db.js so that the path where the database resides may be configured