优化工单模块，增加企微模块

sg_wechat_enterprise/we_api/crypto/pycrypto.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+from __future__ import absolute_import, unicode_literals
+from Crypto.Cipher import AES
+
+
+class WeChatCipher(object):
+
+    def __init__(self, key):
+        self.cipher = AES.new(key, AES.MODE_CBC, key[:16])
+
+    def encrypt(self, plaintext):
+        return self.cipher.encrypt(plaintext)
+
+    def decrypt(self, ciphertext):
+        return self.cipher.decrypt(ciphertext)