add function to register the domains from config

lib/modules/ens/index.js

@@ -225,6 +225,33 @@ class ENS {
     });
   }
 
+  registerConfigDomains(config, cb) {
+    const self = this;
+    self.events.request("blockchain:defaultAccount:get", (defaultAccount) => {
+      self.events.request("blockchain:contract:create",
+        {abi: config.registrarAbi, address: config.registrarAddress},
+        (registrar) => {
+          async.each(Object.keys(self.registration.domains), (subDomainName, eachCb) => {
+            const toSend = registrar.methods.register(utils.sha3(subDomainName),
+              defaultAccount, self.registration.domains[subDomainName]);
+
+            toSend.estimateGas().then(gasEstimated => {
+              return toSend.send({gas: gasEstimated + 1000, from: defaultAccount}).then(transaction => {
+                if (transaction.status !== "0x1" && transaction.status !== "0x01" && transaction.status !== true) {
+                  return eachCb('Failed to register. Check gas cost.');
+                }
+                eachCb(null, transaction);
+              }).catch(err => {
+                eachCb('Failed to register with error: ' + (err.message || err));
+              });
+            }).catch(err => {
+              eachCb("Register would error. Is it already registered? Do you have token balance? Is Allowance set? " + (err.message || err));
+            });
+          }, cb);
+        });
+    });
+  }
+
   addENSToEmbarkJS() {
     const self = this;