Remove resend_code.
Fix #60 -- Separate /sms/verify_code and /certificate/sign
Remove fxa- prefixes inside BrowserID certificates.
Fix #69 -- req.body is not recursively JSON.parse'd
Tarek review.
Merge pull request #60 from mozilla-services/60-sign

Separate /v1/msisdn/sms/verify_code and /v1/msisdn/certificate/sign