Fixes #163 - small fix in the mangling logic, renames all expected test files

lib/src/info.dart

Index: lib/src/info.dart
diff --git a/lib/src/info.dart b/lib/src/info.dart
index 4ea6d4e9f0e7fe6d1830085fb355482f155b13be..2c1c499dd5d8f1e8cdd06b4acd7bca33c77380a4 100644
--- a/lib/src/info.dart
+++ b/lib/src/info.dart
@@ -39,7 +39,10 @@ class PathInfo {
   /** Default prefix added to all filenames. */
   static const String _DEFAULT_PREFIX = '_';
 
-  PathInfo(this._baseDir, this._outputDir, [this._mangleFilenames = true]);
+  PathInfo(Path baseDir, Path outputDir, [bool forceMangle = false])
+      : _baseDir = baseDir,
+        _outputDir = outputDir,
+        _mangleFilenames = forceMangle || (baseDir == outputDir);
 
   /** Add a prefix and [suffix] if [_mangleFilenames] is true */
   String mangle(String name, String suffix, [bool forceSuffix = false]) =>