Replaced six MovedAttribute with try catch in order to prevent six requirement in order to run setup.py (#43)

Author: bporter125

launchkey/__init__.py

@@ -1,10 +1,4 @@
 """LaunchKey Service SDK module"""
-from six import add_move, MovedAttribute
-
-add_move(MovedAttribute('encodebytes',
-                        'base64', 'base64',
-                        'encodestring', 'encodebytes'))
-
 SDK_VERSION = '3.3.0'
 LAUNCHKEY_PRODUCTION = "https://api.launchkey.com"
 VALID_JWT_ISSUER_LIST = ["svc", "dir", "org"]

launchkey/clients/organization.py

@@ -3,7 +3,10 @@
 # pylint: disable=too-many-public-methods,invalid-name,deprecated-method
 # pylint: disable=too-many-arguments
 
-from base64 import encodestring
+try:
+    from base64 import encodebytes as encodestring
+except ImportError:  # pragma: no cover
+    from base64 import encodestring
 from .base import ServiceManagingBaseClient, api_call
 from ..utils.shared import iso_format
 from ..entities.shared import PublicKey