Inventory fetch of 0 could auto-update neatly to reflect real inventory at LCBO

[phderome]

Inventory fetch on recommend is made asynchronously from browser when product is freshly fetched (cache miss) from server. This is because it'd be slow to fetch synchronously many products at once from back end assuming many concurrent clients. Ideally, we want comet as per Lift or actor-like behaviour to have server update/refresh once cached inventory becomes available as server push.

The usage of comet in Lift would have to be well assimilated to address this issue.