Refs #58 - Refs #59 — Link everything to hawkId.
Refs #59 — Upgrade the MOMT workflow.
Fix #67 — Always pass a hawkHmacId to the storage backend.
Fix #66 — Let define the long and short verification code length in the configuration.
Merge pull request #59 from mozilla-services/59-upgrade-momt-flow

Change the MOMT flow to use a SMS initiator
Fix #56 — Be able to ask for long or short verificationCode. on /sms/mt/verify
Alexis review.