reorganize and cleanup php server code

server/app/Repositories/Country/CountryRepository.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Vanguard\Repositories\Country;
+
+interface CountryRepository
+{
+    /**
+     * Create $key => $value array for all available countries.
+     *
+     * @param string $column
+     * @param string $key
+     * @return mixed
+     */
+    public function lists($column = 'name', $key = 'id');
+
+    /**
+     * Get all available countries.
+     * @return mixed
+     */
+    public function all();
+}

server/app/Repositories/Country/EloquentCountry.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Vanguard\Repositories\Country;
+
+use Vanguard\Country;
+
+class EloquentCountry implements CountryRepository
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function lists($column = 'name', $key = 'id')
+    {
+        return Country::orderBy('name')->pluck($column, $key);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function all()
+    {
+        return Country::all();
+    }
+}