Move 2.7 to 2 (#635)

Closes #579.

stdlib/2/getopt.pyi

@@ -0,0 +1,17 @@
+from typing import List, Tuple
+
+class GetoptError(Exception):
+    opt = ... # type: str
+    msg = ... # type: str
+    def __init__(self, msg: str, opt: str=...) -> None: ...
+    def __str__(self) -> str: ...
+
+error = GetoptError
+
+def getopt(args: List[str], shortopts: str,
+           longopts: List[str]=...) -> Tuple[List[Tuple[str, str]],
+                                             List[str]]: ...
+
+def gnu_getopt(args: List[str], shortopts: str,
+           longopts: List[str]=...) -> Tuple[List[Tuple[str,str]],
+                                             List[str]]: ...