Things that need to be done

- [x] Setup linter correctly.
- [x] Setup testing. Currently karma is being used. Remove that and replace with Jest.
- [x] Create unit tests.
- [x] Setup circleci.
- [ ] e2e tests

Feature ideas:

- `$user.hasAccess({ name: "routename" })`. This could be useful for conditionally displaying links depending on access.
- `$user.set({...}, { redirect: false })`. Stop the page from automatically redirect when setting a user.

Other:
- Usage with Vuex?