only enabble register in dev

lib/modules/ens/embarkjs.js

@@ -250,4 +250,4 @@ __embarkENS.isAvailable = function () {
 
 __embarkENS.register = function () {
   return new Error("Not available with ENS");
-};
+}

lib/modules/ens/index.js

@@ -41,6 +41,7 @@ class ENS {
       ], (err, results) => {
         // result[0] => ENSRegistry; result[1] => FIFSRegistrar; result[2] => FIFSRegistrar
         let config = {
+          env: self.env,
           registration: self.registration,
           registryAbi: results[0].abiDefinition,
           registryAddress: results[0].deployedAddress,