Ignore files starting with an underscore

lib/pico.php

@@ -232,6 +232,13 @@ class Pico {
 				unset($pages[$key]);
 				continue;
 			}			
+
+			// Ignore files starting with an underscore
+			if (substr(basename($page), 0, 1) == '_') {
+				unset($pages[$key]);
+				continue;
+			}
+
 			// Get title and format $page
 			$page_content = file_get_contents($page);
 			$page_meta = $this->read_file_meta($page_content);