Collapse "min" into project root and get unit tests working.

Fixes #472

lib/Minify/Env.php

@@ -0,0 +1,90 @@
+<?php
+
+class Minify_Env {
+
+    /**
+     * @return null
+     */
+    public function getDocRoot()
+    {
+        return $this->server['DOCUMENT_ROOT'];
+    }
+
+    /**
+     * @return null
+     */
+    public function getRequestUri()
+    {
+        return $this->server['REQUEST_URI'];
+    }
+
+    public function __construct($options = array())
+    {
+        $options = array_merge(array(
+            'server' => $_SERVER,
+            'get' => $_GET,
+            'cookie' => $_COOKIE,
+        ), $options);
+
+        $this->server = $options['server'];
+        if (empty($this->server['DOCUMENT_ROOT'])) {
+            $this->server['DOCUMENT_ROOT'] = $this->computeDocRoot($options['server']);
+        }
+        $this->get = $options['get'];
+        $this->cookie = $options['cookie'];
+    }
+
+    public function server($key = null)
+    {
+        if (null === $key) {
+            return $this->server;
+        }
+        return isset($this->server[$key])
+            ? $this->server[$key]
+            : null;
+    }
+
+    public function cookie($key = null)
+    {
+        if (null === $key) {
+            return $this->cookie;
+        }
+        return isset($this->cookie[$key])
+            ? $this->cookie[$key]
+            : null;
+    }
+
+    public function get($key = null)
+    {
+        if (null === $key) {
+            return $this->get;
+        }
+        return isset($this->get[$key])
+            ? $this->get[$key]
+            : null;
+    }
+
+    protected $server = null;
+    protected $get = null;
+    protected $cookie = null;
+
+    /**
+     * Compute $_SERVER['DOCUMENT_ROOT'] for IIS using SCRIPT_FILENAME and SCRIPT_NAME.
+     *
+     * @param array $server
+     * @return string
+     */
+    protected function computeDocRoot(array $server)
+    {
+        if (empty($server['SERVER_SOFTWARE'])
+                || 0 !== strpos($server['SERVER_SOFTWARE'], 'Microsoft-IIS/')) {
+            throw new InvalidArgumentException('DOCUMENT_ROOT is not provided and could not be computed');
+        }
+        $docRoot = substr(
+            $server['SCRIPT_FILENAME']
+            ,0
+            ,strlen($server['SCRIPT_FILENAME']) - strlen($server['SCRIPT_NAME'])
+        );
+        return rtrim($docRoot, '\\');
+    }
+}