Remove the unicode_literals from most files

nacl/__init__.py

 from __future__ import absolute_import
 from __future__ import division
-from __future__ import unicode_literals
 
 from . import __about__
 from . import hash  # pylint: disable=W0622

nacl/exceptions.py

 from __future__ import absolute_import
 from __future__ import division
-from __future__ import unicode_literals
 
 
 class CryptoError(Exception):

nacl/hash.py

 from __future__ import absolute_import
 from __future__ import division
-from __future__ import unicode_literals
 
 import binascii
 

nacl/nacl.py

@@ -3,7 +3,6 @@ CFFI interface to NaCl and libsodium library
 """
 from __future__ import absolute_import
 from __future__ import division
-from __future__ import unicode_literals
 
 import functools
 

nacl/random.py

 from __future__ import absolute_import
 from __future__ import division
-from __future__ import unicode_literals
 
 from . import nacl