Much of the infrastructure to run "self test" tests (those which test
core functionality of the `meteor` tool itself) in PhantomJS and
BrowserStack was already in place, though the BrowserStack portion had
been disabled some time ago, though the exact reason isn't entirely
clear.
BrowserStack could play an important roll in Meteor's future as Meteor
works to ensure that the bundle delivered to the client is appropriate
for that client's capabilities, including appropriate polyfills to
implement functionality not natively available in the browser (e.g.
ECMAScript features, SockJS, etc.).
