Move Crypto to 2and3 and generate rest of stubs. (#782)

I implemented strong types for Crypto.Cipher

out/Crypto/Util/Counter.pyi

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+# Stubs for Crypto.Util.Counter (Python 3.5)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from typing import Any
+from Crypto.Util.py21compat import *
+from Crypto.Util.py3compat import *
+
+def new(nbits, prefix: Any = ..., suffix: Any = ..., initial_value: int = ..., overflow: int = ..., little_endian: bool = ..., allow_wraparound: bool = ..., disable_shortcut: bool = ...): ...

out/Crypto/Util/__init__.pyi

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+# Stubs for Crypto.Util (Python 3.5)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+# Names in __all__ with no definition:
+#   RFC1751
+#   asn1
+#   number
+#   randpool
+#   strxor

out/Crypto/Util/py3compat.pyi

@@ -0,0 +1,11 @@
+# Stubs for Crypto.Util.py3compat (Python 3.5)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+__revision__ = ...  # type: str
+
+def b(s): ...
+def bchr(s): ...
+def bstr(s): ...
+def bord(s): ...
+def tobytes(s): ...