New user registration

POST http://127.0.0.1/api/user/new

{
	"mail": "[e-mail]",
	"pass": "test3"
}

success response: {"success": true,"account_id": 15,"address": "4q9gCwTnXXy7WF485rAhDxUoYY08XH6E"}

fail response: {"success":"false","error":"duplicate account"}