Add registrion id push test code;

tests/test_registrationid.py

+# -*- coding: utf-8 -*-
+'''Test sending msg by registration id'''
+import time
+from jpush import JPushClient
+
+sendno = int(time.time())
+app_key = 'dd1066407b044738b6479275'
+master_secret = '2b38ce69b1de2a7fa95706ea'
+
+jpush_client = JPushClient(master_secret)
+reg_id = '0900e8d85ef'
+
+jpush_client.send_notification_by_registrationid(reg_id, app_key, sendno, 'des',
+                                        'registration id notify title',
+                                        'registration id notify content', 'android')