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

Fixes #472

lib/Minify/SourceInterface.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * Interface Minify_SourceInterface
+ * @package Minify
+ */
+
+/**
+ * A content source to be minified by Minify.
+ *
+ * This allows per-source minification options and the mixing of files with
+ * content from other sources.
+ *
+ * @package Minify
+ */
+interface Minify_SourceInterface {
+
+    /**
+     * Get the minifier
+     *
+     * @return callable|null
+     */
+    public function getMinifier();
+
+    /**
+     * Set the minifier
+     *
+     * @param callable $minifier
+     * @return void
+     */
+    public function setMinifier($minifier);
+
+    /**
+     * Get options for the minifier
+     *
+     * @return array
+     */
+    public function getMinifierOptions();
+
+    /**
+     * Set options for the minifier
+     *
+     * @param array $options
+     * @return void
+     */
+    public function setMinifierOptions(array $options);
+
+    /**
+     * Get the content type
+     *
+     * @return string
+     */
+    public function getContentType();
+
+    /**
+     * Get content
+     *
+     * @return string
+     */
+    public function getContent();
+
+    /**
+     * Get last modified timestamp
+     *
+     * @return int
+     */
+    public function getLastModified();
+
+    /**
+     * Get id
+     *
+     * @return string
+     */
+    public function getId();
+
+    /**
+     * Get the path of the file that this source is based on (may be null)
+     *
+     * @return string|null
+     */
+    public function getFilePath();
+}