cleanup(test): Disable IE8 tests.
cleanup(test): Disable IE8 tests.

We do not support IE8 and can safely disable the tests.

fixes #143

mozilla/fxa-js-client,chilts/fxa-js-client,chilts/fxa-js-client,mozilla/fxa-js-client,vladikoff/fxa-js-client,vladikoff/fxa-js-client,mozilla/fxa-js-client