Fix torquebox messaging race condition

Razor::Messaging::Sequel is loaded in a new Torquebox environment to
process messages, so it naturally needs to load the entire razor
environment as well. Calling `require '../../razor' at the top of the
file, though, caused the files in lib/razor/data to be loaded before
the lib/razor/messaging/sequel.rb had finished being loading. This
didn't show up until trying to run `rake console` from the
command-line, at which point initialization would fail.