Merge pull request #599 from alex/import-sort

Sort our imports
diff --git a/cryptography/fernet.py b/cryptography/fernet.py
index c19309d..71a9fad 100644
--- a/cryptography/fernet.py
+++ b/cryptography/fernet.py
@@ -22,8 +22,8 @@
 from cryptography.exceptions import InvalidSignature
 from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import padding, hashes
-from cryptography.hazmat.primitives.hmac import HMAC
 from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+from cryptography.hazmat.primitives.hmac import HMAC
 
 
 class InvalidToken(Exception):
diff --git a/cryptography/hazmat/backends/openssl/backend.py b/cryptography/hazmat/backends/openssl/backend.py
index d886932..fc3c3bd 100644
--- a/cryptography/hazmat/backends/openssl/backend.py
+++ b/cryptography/hazmat/backends/openssl/backend.py
@@ -22,15 +22,15 @@
 from cryptography.hazmat.backends.interfaces import (
     CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend, RSABackend
 )
+from cryptography.hazmat.bindings.openssl.binding import Binding
 from cryptography.hazmat.primitives import interfaces, hashes
+from cryptography.hazmat.primitives.asymmetric import rsa
 from cryptography.hazmat.primitives.ciphers.algorithms import (
     AES, Blowfish, Camellia, TripleDES, ARC4,
 )
 from cryptography.hazmat.primitives.ciphers.modes import (
     CBC, CTR, ECB, OFB, CFB, GCM,
 )
-from cryptography.hazmat.bindings.openssl.binding import Binding
-from cryptography.hazmat.primitives.asymmetric import rsa
 
 
 @utils.register_interface(CipherBackend)