Merge and rename stdlib/{2,3}/pprint.pyi into 2and3 (#1124)

* Merge stdlib/{2,3}/pprint.pyi

* Rename pprint.pyi into 2and3

stdlib/2/pprint.pyi

@@ -1,24 +0,0 @@
-# Stubs for pprint (Python 2)
-#
-# NOTE: Based on a dynamically typed automatically generated by stubgen.
-
-from typing import IO, Any
-
-def pprint(object: Any, stream: IO[str] = ..., indent: int = ..., width: int = ...,
-           depth: int = ...) -> None: ...
-def pformat(object: Any, indent: int =..., width: int =..., depth: int =...) -> str: ...
-def saferepr(object): ...
-def isreadable(object): ...
-def isrecursive(object): ...
-
-class PrettyPrinter:
-    def __init__(self,
-                 indent: int = ...,
-                 width: int = ...,
-                 depth: int = ...,
-                 stream: IO[Any] = ...) -> None: ...
-    def pprint(self, object: Any) -> str: ...
-    def pformat(self, object): ...
-    def isrecursive(self, object): ...
-    def isreadable(self, object): ...
-    def format(self, object, context, maxlevels, level): ...

stdlib/2and3/pprint.pyi

@@ -1,6 +1,7 @@
 # Stubs for pprint
 
-# Based on http://docs.python.org/3.2/library/pprint.html
+# Based on http://docs.python.org/2/library/pprint.html
+# Based on http://docs.python.org/3/library/pprint.html
 
 from typing import Any, Dict, Tuple, IO