Provide command to gather networking diagnostics

[jasonrudolph]

To help debug things that may interfere with real-time collaboration, consider providing a command that attempts to diagnose the user's current networking situation. For example:

• Can Atom contact the Teletype server?
• Can Atom contact Twilio?
• Can Atom contact Pusher, and can Pusher contact Atom?
  etc.

Then, display the results in a way that the user can read and also share with us to help us debug any connectivity issues.