Adds cleanup steps when uninstalling the plugin

When uninstalling from the dashboard the plugin will now remove the
symlinks created as well as the options from the database.

fixes: wpugph#33

uninstall.php

@@ -8,3 +8,22 @@
 if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
 	exit;
 }
+
+// loading up to get the home path
+require_once ABSPATH . 'wp-admin/includes/file.php';
+// load the easy-symlinks file so we can later get token and version
+include_once 'easy-symlinks.php';
+
+// unlink paths
+$links = maybe_unserialize( get_option( 'caes_symlink_list' ) );
+foreach ($links as $key => $value) {
+	$link = strstr( $value, ' ->', true );
+	unlink( get_home_path() . $link );
+}
+
+// remove options
+delete_option( easy_symlinks()->token . 'version', easy_symlinks()->version );
+delete_option( 'caes_symlink_list' );
+delete_option( 'caes_symlink_list_lastdelete' );
+delete_option( 'caes_target' );
+delete_option( 'caes_link' );