Fix connection to IPC

- Make sure the folder .embark exist otherwise the first time there is a
run, the connection abort
- Fix the number of args in the callback function

lib/core/ipc.js

@@ -38,6 +38,7 @@ class IPC {
   }
 
   serve() {
+    fs.mkdirpSync(fs.dappPath(".embark"));
     ipc.serve(this.socketPath, () => {});
     ipc.server.start();
 
@@ -50,7 +51,7 @@ class IPC {
       if (data.action !== action) {
         return;
       }
-      let reply = function(replyData) {
+      let reply = function(_err, replyData) {
         self.reply(socket, 'compile', replyData);
       };
       done(data.message, reply, socket);
@@ -66,7 +67,7 @@ class IPC {
       if (msg.action !== action) {
         return;
       }
-      cb(msg.message);
+      cb(null, msg.message);
     });
   }
 

lib/tests/test.js

@@ -119,8 +119,8 @@ class Test {
       web3: this.web3
     });
     this.engine.startService("deployment", {
-      trackContracts: false
-      //ipcRole: 'client' // disabled for now due to issues with ipc file
+      trackContracts: false,
+      ipcRole: 'client'
     });
     this.events.request('deploy:setGasLimit', 6000000);
   }