Cleanup after setup failure

[dkundel]

If you start the dev-phone command and something fails it currently doesn't clean up after itself.

Way to replicate: have 50 Serverless Services in your Twilio account and run twilio dev-phone.

[ayyrickay]

Most of the backend requests now have appropriate try-catch blocks - so we could abstract all the "destroy" functions in a single function call and then call that in each catch block.