Added TravelspikeTraveltorial creative type to the ingestion UI.
Auth: Add anonymous access for userverification.html to stand-alone
UX: Cleanup user verification process
 * UserVerification.html drops a cookie and redirects to SignIn.html
 * SignIn.aspx (redirected to by SignIn.html) picks up cookie and POSTs user the confirmation
Extensions: Add string.Detokenize extension for replacing tokens in strings
 * Default uses ${TokenName} formatted tokens and throws exceptions on unmatched tokens
 * Overloads included for custom token patterns and to ignore unmatched tokens (leaving the tokens unreplaced in the result)