Temporarily removed reference to polyfills to fix issue in dist.
Merge pull request #206 from mozilla/issue-199-remove-polyfills

Temporarily removed reference to polyfills to fix issue in dist.

This failure is caused by running the old FxA JS client with the new fxa-auth-server. I am OK with this failure, because it goes away when using the new client.

r+. Thanks @nchapman!