Fixes credential storage.
Fixes credential storage.

Previously, we pulled in the a polyfill (I think `core-js`) that would serialize `Map` to an array of pairs.  Once that polyfill was removed, map now serializes to `{}`.  This makes it so when we serialize a `User` it handles `Map` by serializing it into an array of pairs again.

Zoltu/RepoCreator-Client,Zoltu/RepoCreator-Client,Zoltu/RepoCreator-Client,Zoltu/RepoCreator-Client