implement generic method runtime behavior, fixes #301

lib/src/compiler/compiler.dart

Index: lib/src/compiler/compiler.dart
diff --git a/lib/src/compiler/compiler.dart b/lib/src/compiler/compiler.dart
index 891cedeaf12cebd6a22afd6e6cdffea4691a35ad..fa6ea22859aacc776736e5cc1df44dbabc3fba21 100644
--- a/lib/src/compiler/compiler.dart
+++ b/lib/src/compiler/compiler.dart
@@ -67,7 +67,7 @@ class ModuleCompiler {
       if (sourceUri.scheme == '') {
         sourceUri = path.toUri(path.absolute(sourcePath));
       }
-      Source source = context.sourceFactory.forUri(sourceUri.toString());
+      Source source = context.sourceFactory.forUri2(sourceUri);
       if (source == null) {
         throw new AnalysisException('could not create a source for $sourcePath.'
             ' The file name is in the wrong format or was not found.');