Update jquery.sharrre.js

Facebook maintains a limit for requests, while on low-traffic sites this means nothing,
on high-level sites, this might pose as a critical issue.

The solution here has two levels:
1. use facebook cache on akamai
2. use server-side controller (metadatacontroller.cs) for c# based sites - which enables us to use server-side caching, and save redundant calls to facebook.

of course the result means that there is a delay between each update on facebook shares (rough estimate - 30 minutes delay).

I think this is completely tolerable although tests might fail because of this.