Shut down APN client on send completion - fix memory leak #54
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Probably related: #47 , #44
The below graph is memory usage of our application, before and after applying this patch
![screen shot 2017-06-23 at 08 43 40](https://user-images.githubusercontent.com/655660/27471997-a68ae8d6-57f1-11e7-9bef-91a9d62ca875.png)