fixes #219, able to compile multiple entry points

lib/src/codegen/js_module_item_order.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:collection' show HashMap;
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
-import 'package:dev_compiler/src/dependency_graph.dart' show corelibOrder;
+import 'package:dev_compiler/src/compiler.dart' show corelibOrder;
 
 typedef void ModuleItemEmitter(AstNode item);
 
 /// Helper that tracks order of elements visited by the compiler, detecting
 /// if the top level item can be loaded eagerly or not.
 class ModuleItemLoadOrder {
 
   /// The order that elements should be emitted in, with a bit indicating if
   /// the element should be generated lazily. The value will be `false` if
   /// the item could not be loaded, and needs to be made lazy.
@@ skipping 207 matching lines @@
     }
     return _libraryCycleMemo[library] = result;
   }
 
   /// Returns whether this is a library imported with 'dart:' URI.
   ///
   /// This is similar to [LibraryElement.isInSdk], but checking the URI instead
   /// of the library naming convention, because the URI is reliable.
   static bool _isDartUri(LibraryElement e) => e.source.uri.scheme == 'dart';
 }