call it what it is and change 'CookieSessionMiddleware' to just 'SignedCookieMiddleware', to make room for real sessions
add some options to SignedCookie
fix up erosion to use SignedCookieMiddleware and save links with schema
re-enable Route-specific kwargs
erosion hackin. it's workin pretty aight.
erosion now actually tracks link clicks and marks things as expired, etc.