FEATURE: add string id for action log types.

This string ID will be used in each logger for better readability (we will use string identifier except the "magical" integer constant)

database/migrations/2016_01_28_213204_AddStringIdForActionTypes.php

@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+class AddStringIdForActionTypes extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('action_log_types', function (Blueprint $table) {
+            $table->string('string_id', 64)
+                  ->after('id')
+                  ->unique()->comment = 'String ID used for better readability in loggers';
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('action_log_types', function (Blueprint $table) {
+            $table->dropColumn('string_id');
+        });
+    }
+}