Changed tracking into to datetime field

- Added moment.js for formatting dates
-

InvenTree/stock/migrations/0003_auto_20180510_1042.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.12 on 2018-05-10 10:42
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0002_auto_20180430_1218'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='stockitemtracking',
+            name='date',
+            field=models.DateTimeField(auto_now_add=True),
+        ),
+    ]