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Add meta_request for RailsPanel

For those out there who would like to use RailsPanel
(https://chrome.google.com/webstore/detail/railspanel/gjpfobpafnhjhbajcjgccbbdofdckggg/related),
this allows you do see request information in the Chrome inspector.
Simplify notifications rendering call
Commits have a URL in production, they need it in dev
Simplify notification partial. Fewer Demeter violations too