Closes #24 — MSISDN is not required in /register and /sms/verify has been renamed to /sms/mt/verify to allow MOMT namespace.
Move /sms/resend_code to /sms/mt/resend_code
Merge pull request #30 from mozilla-services/24_sms_mt_mo

Closes #24 — MSISDN is not required in /register and /sms/verify has been renamed.

r=tarekziade