Add failing capitalization tests for address_info
address_info is now case-insensitive with both json and mysql databases
address_info now returns the email's canonical form
Update the front end for email canonicalization.

The theory:
* Get the canonical form of an email as soon as the user types it in.
* Pass the canonical form around so there is no worry as to what email is being worked with.
sign-in-test now checks to see if case insensitivity works in the dialog.