Add verbose logging for filters, requests & views.

Used a different namespace for filter logging as it's likely you'll want to
be able to toggle and/or view this information separately from the rest of the
controller logs.

Example:

    splinky-controllers request +26s GET /users/
    splinky-filters filter enter +26s 00-pre-pause
    splinky-filters filter leave +0ms 00-pre-pause
    splinky-filters filter enter +0ms 02-gzip
    splinky-filters filter leave +0ms 02-gzip
    splinky-filters filter enter +0ms 03-query
    splinky-filters filter leave +0ms 03-query
    splinky-filters filter enter +0ms 04-auth-filter
    splinky-filters filter leave +0ms 04-auth-filter
    splinky-filters filter enter +0ms 04-body-parser0
    splinky-filters filter leave +0ms 04-body-parser0
    splinky-controllers render view +3ms users