Bug 1049916 - Create Firefox Accounts smoke tests to validate user authe...

...ntication R=spenrose
What would you think of turning those examples into tests for the server process? I realize this PR has been open for a long time, and I understand if you'd rather defer that till later--but it would be great to have concrete examples showing that the parent and child handle various disaster scenarios gracefully.

Also, if you can gist or pastebin your input/output, I'm happy to try to run the tests and see if I can duplicate your results.