UX: improve messaging so notifications list is far more stable
PERF: improve performance of notifcation lookup queries
- Add feature "SetTransientHeader" that allows shipping info to server
in the next Ajax request
- remove local storage hack used for notifications
- amend lookupStale to return hydrated objects, move logic into store
- stop magically clearing various notifications (likes, invitee accepted, group_summary, granted badge)
Sometimes you want stale data right away, then refresh it async.
This adds `findStale` to the store for that case. If it returns
an object with `hasResults` you can get the `results` and display
them.
It also returns a `refresh()` method to freshen up the stale data.
To enable `localStorage` support for stale data, just include the
mixin `StaleLocalStorage` into an adapter for that model. This
commit includes a sample of doing that for `Notifications`.
