Stubgen some more stdlib modules.

Copy doctest.pyi from 3 to 2.7.

stdlib/2.7/doctest.pyi

@@ -0,0 +1,9 @@
+# Stubs for doctest
+
+# NOTE: These are incomplete!
+
+from typing import Any, Tuple
+
+# TODO arguments missing
+def testmod(m: Any = ..., name: str = ..., globs: Any = ...,
+            verbose: bool = ...) -> Tuple[int, int]: ...

stdlib/2.7/platform.pyi

@@ -0,0 +1,45 @@
+# Stubs for platform (Python 2)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from typing import Any
+
+__copyright__ = ... # type: Any
+DEV_NULL = ... # type: Any
+
+def libc_ver(executable=..., lib='', version='', chunksize=2048): ...
+def linux_distribution(distname='', version='', id='', supported_dists=..., full_distribution_name=1): ...
+def dist(distname='', version='', id='', supported_dists=...): ...
+
+class _popen:
+    tmpfile = ... # type: Any
+    pipe = ... # type: Any
+    bufsize = ... # type: Any
+    mode = ... # type: Any
+    def __init__(self, cmd, mode='', bufsize=None): ...
+    def read(self): ...
+    def readlines(self): ...
+    def close(self, remove=..., error=...): ...
+    __del__ = ... # type: Any
+
+def popen(cmd, mode='', bufsize=None): ...
+def win32_ver(release='', version='', csd='', ptype=''): ...
+def mac_ver(release='', versioninfo=..., machine=''): ...
+def java_ver(release='', vendor='', vminfo=..., osinfo=...): ...
+def system_alias(system, release, version): ...
+def architecture(executable=..., bits='', linkage=''): ...
+def uname(): ...
+def system(): ...
+def node(): ...
+def release(): ...
+def version(): ...
+def machine(): ...
+def processor(): ...
+def python_implementation(): ...
+def python_version(): ...
+def python_version_tuple(): ...
+def python_branch(): ...
+def python_revision(): ...
+def python_build(): ...
+def python_compiler(): ...
+def platform(aliased=0, terse=0): ...