Move 2.7 to 2 (#635)

Closes #579.

stdlib/2/encodings/__init__.pyi

@@ -0,0 +1,6 @@
+import codecs
+
+import typing
+
+def search_function(encoding: str) -> codecs.CodecInfo:
+    ...

stdlib/2/encodings/utf_8.pyi

@@ -0,0 +1,14 @@
+import codecs
+
+class IncrementalEncoder(codecs.IncrementalEncoder):
+    pass
+class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
+    pass
+class StreamWriter(codecs.StreamWriter):
+    pass
+class StreamReader(codecs.StreamReader):
+    pass
+
+def getregentry() -> codecs.CodecInfo: pass
+def encode(input: str, errors: str = ...) -> bytes: pass
+def decode(input: bytes, errors: str = ...) -> str: pass