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/weakref.pyi

@@ -0,0 +1,66 @@
+# Stubs for weakref (Python 2)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from typing import Any
+import UserDict
+from _weakref import getweakrefcount as getweakrefcount, getweakrefs as getweakrefs, ref as ref, proxy as proxy, CallableProxyType as CallableProxyType, ProxyType as ProxyType, ReferenceType as ReferenceType
+from _weakrefset import WeakSet as WeakSet
+from exceptions import ReferenceError as ReferenceError
+
+ProxyTypes = ... # type: Any
+
+class WeakValueDictionary(UserDict.UserDict):
+    def __init__(self, *args, **kw): ...
+    def __getitem__(self, key): ...
+    def __delitem__(self, key): ...
+    def __contains__(self, key): ...
+    def has_key(self, key): ...
+    def __setitem__(self, key, value): ...
+    def clear(self): ...
+    def copy(self): ...
+    __copy__ = ... # type: Any
+    def __deepcopy__(self, memo): ...
+    def get(self, key, default=None): ...
+    def items(self): ...
+    def iteritems(self): ...
+    def iterkeys(self): ...
+    __iter__ = ... # type: Any
+    def itervaluerefs(self): ...
+    def itervalues(self): ...
+    def popitem(self): ...
+    def pop(self, key, *args): ...
+    def setdefault(self, key, default=None): ...
+    def update(self, dict=None, **kwargs): ...
+    def valuerefs(self): ...
+    def values(self): ...
+
+class KeyedRef(ReferenceType):
+    key = ... # type: Any
+    def __new__(type, ob, callback, key): ...
+    def __init__(self, ob, callback, key): ...
+
+class WeakKeyDictionary(UserDict.UserDict):
+    data = ... # type: Any
+    def __init__(self, dict=None): ...
+    def __delitem__(self, key): ...
+    def __getitem__(self, key): ...
+    def __setitem__(self, key, value): ...
+    def copy(self): ...
+    __copy__ = ... # type: Any
+    def __deepcopy__(self, memo): ...
+    def get(self, key, default=None): ...
+    def has_key(self, key): ...
+    def __contains__(self, key): ...
+    def items(self): ...
+    def iteritems(self): ...
+    def iterkeyrefs(self): ...
+    def iterkeys(self): ...
+    __iter__ = ... # type: Any
+    def itervalues(self): ...
+    def keyrefs(self): ...
+    def keys(self): ...
+    def popitem(self): ...
+    def pop(self, key, *args): ...
+    def setdefault(self, key, default=None): ...
+    def update(self, dict=None, **kwargs): ...