fixes #226 super == and fixes #227 escape \r \f

lib/src/codegen/js_codegen.dart

Index: lib/src/codegen/js_codegen.dart
diff --git a/lib/src/codegen/js_codegen.dart b/lib/src/codegen/js_codegen.dart
index 99b6e21a478354d30df987ae992f274f8f0ba2fb..a559435c57d6764fd4dc1fe720ab5df941c5bd07 100644
--- a/lib/src/codegen/js_codegen.dart
+++ b/lib/src/codegen/js_codegen.dart
@@ -1938,6 +1938,8 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
       // We can also do this if both sides are the same primitive type.
       if (_canUsePrimitiveEquality(left, right)) {
         code = op.type == TokenType.EQ_EQ ? '# == #' : '# != #';
+      } else if (left is SuperExpression) {
+        return _emitSend(left, op.lexeme, [right]);
       } else {
         var bang = op.type == TokenType.BANG_EQ ? '!' : '';
         code = '${bang}dart.equals(#, #)';