Load r.strings in "reddit-init" module.

This enables LocalizedModule strings use if the "reddit" module was not
included.
Remove dupe spotlight.js module file.
Add request_origin helper property to c.
Batched, on-demand tracker hash fetching.

Instead of fetching tracking hashes for all applicable elements on the
page, fetch only the visible ones. Uses _.debounce() to batch up
requests during the init process.
Do better job of disabling/enabling stripe button.
Open stripe to all countries.
Don't show hidden promoted links.
Add author_slow to Comment as queries.ban needs it.
Show childless deleted comments if c.user_is_admin.
Domainban:  Take TLDs into account