Small verifier for Persona (aka BrowserID)
Does remote verification using Mozilla's API right now. Will add local verification when it is stable.
You MUST pass the current domain to the options parameter when using this in production or it may accept verifications from any domain.
optionswon't matter until we have local verification
optionsshould be an object providing information about the domain doing the verification
var verify = ;// Assume body was already parsed by some middlewareapp;