FEATURE: remove unused tables (custom fields) from database

database/migrations/2017_08_24_011314_drop_custom_fields_tables.php

@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\Schema;
+
+class DropCustomFieldsTables extends Migration
+{
+    /**
+     * Run the migrations.
+     * @return void
+     */
+    public function up()
+    {
+        Schema::dropIfExists('content_has_custom_fields');
+        Schema::dropIfExists('user_has_custom_field');
+        Schema::dropIfExists('custom_field_types');
+        Schema::dropIfExists('custom_fields');
+        Schema::dropIfExists('custom_field_resource');
+        Schema::dropIfExists('custom_field_resources');
+    }
+
+    /**
+     * Reverse the migrations.
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}