Wrap external calls with try-except #67
Merged
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Solves #53
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![screen shot 2017-11-08 at 10 30 42 am](https://user-images.githubusercontent.com/28450177/32541556-44581346-c470-11e7-89ab-4bd1abac4dca.png)
![screen shot 2017-11-08 at 10 34 22 am](https://user-images.githubusercontent.com/28450177/32541637-8a1876a0-c470-11e7-93d0-4ab3ac1f84d6.png)