Move core and coreimpl from corelib/ to lib/core and lib/coreimpl.

lib/core/core.dart

Index: lib/core/core.dart
diff --git a/lib/core/core.dart b/lib/core/core.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a91db91f4514302bcd40f62809a1538099ada89b
--- /dev/null
+++ b/lib/core/core.dart
@@ -0,0 +1,34 @@
+#library("dart:core");
+#import('dart:math');
+#import("dart:coreimpl");
+#source("bool.dart");
+#source("collection.dart");
+#source("comparable.dart");
+#source("date.dart");
+#source("double.dart");
+#source("duration.dart");
+#source("errors.dart");
+#source("exceptions.dart");
+#source("expando.dart");
+#source("expect.dart");
+#source("function.dart");
+#source("future.dart");
+#source("hashable.dart");
+#source("int.dart");
+#source("iterable.dart");
+#source("iterator.dart");
+#source("list.dart");
+#source("map.dart");
+#source("options.dart");
+#source("num.dart");
+#source("object.dart");
+// TODO: Add num.dart once the editor don't manually add it.
+#source("pattern.dart");
+#source("print.dart");
+#source("queue.dart");
+#source("regexp.dart");
+#source("set.dart");
+#source("stopwatch.dart");
+#source("string_buffer.dart");
+#source("string.dart");
+#source("strings.dart");