Added persistent logging methods

lib/logging.js

@@ -20,4 +20,20 @@ export default class Logging {
             console.log(message)
         }
     }
+
+    static warn(message) {
+        if (ipc) {
+            ipc.send('warn', message)
+        } else {
+            console.warn(message)
+        }
+    }
+
+    static error(message) {
+        if (ipc) {
+            ipc.send('error', message)
+        } else {
+            console.error(message)
+        }
+    }
 }