Class rename, composer add, phpUnit tests add

Rename the class from ReadEnvFile to DotEnv.
Add everything to a composer json file so it can be published to
composer repository.
Add phpUnit tests for system

vendor/myclabs/deep-copy/src/DeepCopy/Matcher/PropertyMatcher.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace DeepCopy\Matcher;
+
+/**
+ * @final
+ */
+class PropertyMatcher implements Matcher
+{
+    /**
+     * @var string
+     */
+    private $class;
+
+    /**
+     * @var string
+     */
+    private $property;
+
+    /**
+     * @param string $class    Class name
+     * @param string $property Property name
+     */
+    public function __construct($class, $property)
+    {
+        $this->class = $class;
+        $this->property = $property;
+    }
+
+    /**
+     * Matches a specific property of a specific class.
+     *
+     * {@inheritdoc}
+     */
+    public function matches($object, $property)
+    {
+        return ($object instanceof $this->class) && $property == $this->property;
+    }
+}