Bug 966386 - Pre: Make it easier to launch Fennec.
Bug 966386 - Part 1: Remove "Firefox Accounts" headers from all screens.
Bug 966386 - Part 2: Promote SubHeader to Header.
Bug 966386 - Part 3: Update CreateAccount and UpdateCredentials headers.
Bug 966386 - Part 4: Make year picker display 1990 or earlier, 1991, ..., 2009.
Bug 966386 - Part 5: Add legal policy to SignIn activity.

It is intended that the policy comes above the button in CreateAccount,
but below it in SignIn; and that the policy not be present at all in
UpdateCredentials.
Bug 966386 - Part 6: Remove email display from VerifiedAccount.
Bug 966386 - Part 7: Add "Back to browsing" buttons to ConfirmAccount and VerifiedAccount.
Bug 966386 - Part 8: Bump copy for notification, verification toasts,
and tap to resend verification email.
Bug 966386 - Post: Remove unused firefox_accounts string.
Bug 965683 - Make spinner the same size as button.
Bug 965683 - Post: Tiny spacing and color tweaks.