added plugin transformer which initializers can extend to do additional post-processing during tran…

lib/src/mirror_loader.dart

Index: lib/src/mirror_loader.dart
diff --git a/lib/src/mirror_loader.dart b/lib/src/mirror_loader.dart
index f3e268904e6e45f903b1a7861760eaca5643e3ca..92a00f84edfe2abb95aae7a4e70bdfd0b420ec4e 100644
--- a/lib/src/mirror_loader.dart
+++ b/lib/src/mirror_loader.dart
@@ -149,8 +149,8 @@ class InitializationCrawler {
         var filePath;
         Uri uri = declaration.uri;
         if (uri.scheme == 'file' || uri.scheme.startsWith('http')) {
-          filePath = path.url.relative(
-              uri.path, from: path.url.dirname(_root.uri.path));
+          filePath = path.url.relative(uri.path,
+              from: path.url.dirname(_root.uri.path));
         } else if (uri.scheme == 'package') {
           var segments = uri.pathSegments;
           package = segments[0];