2.7 stub updates (#149)

* Stubgen modules for 2.7

Cookie
email._parseaddr
email.utils
genericpath
linecache
mimetypes
multiprocessing
multiprocessing.process
multiprocessing.util
posixpath
quopri
runpy
weakref
wsgiref.validate

* 2.7/typing.py: add missing __contains__ definition

* 2.7/subprocess.py: make output argument to CalledProcessError optional

Commit f08160bd did the same for py3.

* 2.7/hmac.pyi: add compare_digest

This function was introduced to the 2.7 series in 2.7.7.

* Stubgen 2.7/ssl.pyi

This replaces a nearly-empty handwritten stub.

* Copy constants and other definitions from py3 to py2 ssl.pyi

* 2.7/__future__.pyi: add methods

* 2.7/_weakref.pyi: backport some definitions from 3.x version

* Stubgen 2.7/locale.pyi

Hand-edited to remove declarations that are redundant (and cause
conflicts with) the "from _locale import *" line.

stdlib/2.7/locale.pyi

@@ -0,0 +1,33 @@
+# Stubs for locale (Python 2)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from typing import Any
+from _locale import *
+
+class _unicode: ...
+
+CHAR_MAX = ... # type: Any
+LC_ALL = ... # type: Any
+LC_COLLATE = ... # type: Any
+LC_CTYPE = ... # type: Any
+LC_MESSAGES = ... # type: Any
+LC_MONETARY = ... # type: Any
+LC_NUMERIC = ... # type: Any
+LC_TIME = ... # type: Any
+Error = ... # type: Any
+
+def localeconv(): ...
+def strcoll(a, b): ...
+def strxfrm(s): ...
+def format(percent, value, grouping=False, monetary=False, *additional): ...
+def format_string(f, val, grouping=False): ...
+def currency(val, symbol=True, grouping=False, international=False): ...
+def str(val): ...
+def atof(string, func=...): ...
+def atoi(str): ...
+def normalize(localename): ...
+def getdefaultlocale(envvars=...): ...
+def getlocale(category=...): ...
+def resetlocale(category=...): ...
+def getpreferredencoding(do_setlocale=True): ...