Added File objects, some fixes, and download module

scripts/slack-backup

@@ -28,12 +28,15 @@ def main():
     parser.add_argument('-c', '--channels', default=[], nargs='+',
                         help='List of channels to perform actions on. '
                         'Default is all channels')
+    parser.add_argument('-t', '--team', default='', help='team name, which is'
+                        ' part of slack url, for example: if url is '
+                        '"https://team.slack.com" than "team" is a name of '
+                        'the team.')
     args = parser.parse_args()
 
-    slack = client.Client(args.token, args.database)
-    slack.update_users()
-    slack.update_channels()
-    slack.update_history(selected_channels=args.channels)
+    slack = client.Client(args)
+    slack.update()
+    # slack.generate_history(Reporter(args.format))
 
 
 if __name__ == "__main__":