Added comments controller, model, repo, and the database schema. Modified existing Page model to associate with comments.

database/migrations/2017_01_01_130541_create_comments_table.php

@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateCommentsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('comments', function (Blueprint $table) {
+            $table->increments('id')->unsigned();                       
+            $table->integer('page_id')->unsigned();
+            $table->longText('text')->nullable();
+            $table->longText('html')->nullable();
+            $table->integer('parent_id')->unsigned()->nullable();
+            $table->integer('created_by')->unsigned();
+            $table->integer('updated_by')->unsigned()->nullable();
+            $table->index(['page_id', 'parent_id']);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('comments');
+    }
+}