Hidelist hotfix (#438)

* Reveal listing index in html attibute. Better loading of hidelist.

* Undoing pull/222 in light of kettle bell attack

#222 was a good attempt, but now that we have pages full of kettle bell listings, this hidelist approach results in pages full of empty or single listings.

Per:
>The only awkwardness of this implementation is that on a page with flagged listings, the grid won't be completely filled up. For example:

So until we convert fully to address-based ids on listings, we stick with the old hidelist technicque of using Listing Indexes. (aka listingId)

* Temporary fix to allow admins to see listing index for an address

* Clarify comment and clean up

Add environment variable reminder

Merge branch 'release-0.3.0'