Redis pipe for request open and close

[jace]

Baseframe should provide the app-level frame as described in hasgeek/coaster#101.

Flask provides just one before_request and after_teardown stack, so this this frame should occupy the first and last position in before_request to construct the stacks and execute them (although shouldn't this be in the view?), and again the last position in after_teardown to do a final execution and clean up.

[jace]

Perhaps the very act of calling with should construct the stacks if they're not already present, so that resolves the problem of being in the first position in before_request.