Move 2.7 to 2 (#635)

Closes #579.

stdlib/2/linecache.pyi

@@ -0,0 +1,7 @@
+# Stubs for linecache (Python 2)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+def getline(filename, lineno, module_globals=None): ...
+def clearcache(): ...
+def checkcache(filename=None): ...