Move 2.7 to 2 (#635)

Closes #579.

stdlib/2/genericpath.pyi

@@ -0,0 +1,14 @@
+# Stubs for genericpath (Python 2)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+class _unicode: ...
+
+def exists(path): ...
+def isfile(path): ...
+def isdir(s): ...
+def getsize(filename): ...
+def getmtime(filename): ...
+def getatime(filename): ...
+def getctime(filename): ...
+def commonprefix(m): ...