Sweet Tooth provides handlers. Rather than registering outright,
handlers are registered with an internal registry using the `rr`
function in this namespace, and the `register-handlers` function is
then used to register the handlers with re-frame. This allows users
to specify interceptors for Sweet Tooth's handlers.

TODO: document how you can apply interceptors hierarchically by ns

Require all namespaces with handlers, so that they're registered
for registration. A little whacky but whatevs.

sweet tooth roots for the re-frame db

deprecated

Sync provides a layer of indirection between requests to read/write
data and the mechanism for handling the request. It also provides a
common interface across those mechanisms.