Document using localStorage shim in certain private browsers #1344
Description
The getStorage implementation needs to be augmented to supported private browsers on Safari OS X, Safari iOS, and Android browsers.
Users typically supply their own storage implementation:
import authentication from 'feathers-authentication/client'
import feathers from 'feathers/client'
var client = feathers()
.configure(authentication({storage: window.localStorage}));window.localStorage is defined on these browsers, so it will be returned, rather than the shim. Consequently, any calls to setItem (e.g., https://github.com/feathersjs/feathers-authentication/blob/fca25f2b5b03b773975595ae9ac034199df5127b/src/client/index.js#L40-L42) will throw exceptions in these browsers.
More info in this comment on #132.