Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/@python2/SimpleHTTPServer.pyi

@@ -0,0 +1,14 @@
+import BaseHTTPServer
+from StringIO import StringIO
+from typing import IO, Any, AnyStr, Mapping, Optional, Union
+
+class SimpleHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
+    server_version: str
+    def do_GET(self) -> None: ...
+    def do_HEAD(self) -> None: ...
+    def send_head(self) -> Optional[IO[str]]: ...
+    def list_directory(self, path: Union[str, unicode]) -> Optional[StringIO[Any]]: ...
+    def translate_path(self, path: AnyStr) -> AnyStr: ...
+    def copyfile(self, source: IO[AnyStr], outputfile: IO[AnyStr]): ...
+    def guess_type(self, path: Union[str, unicode]) -> str: ...
+    extensions_map: Mapping[str, str]