Fix hex encoding of message to create valid hex strings

app/scripts/lib/personal-message-manager.js

@@ -118,8 +118,21 @@ module.exports = class PersonalMessageManager extends EventEmitter{
       log.debug(`Message was not hex encoded, interpreting as utf8.`)
     }
 
-    return ethUtil.bufferToHex(new Buffer(data, 'utf8'))
+    return hexEncode(data)
+  }
+
+  hexEncode(text){
+    var hex, i
+
+    var result = ''
+    for (i = 0; i < text.length; i++) {
+      hex = text.charCodeAt(i).toString(16)
+      result += ('000'+hex).slice(-4)
+    }
+    return '0x' + result
   }
 
 }
 
+
+