Glimpse

Allows an admin to find blobs by key and then delete everything they find. This is helpful in testing. Especially after the name change from Glancer to Glimpse, where I needed to be sure that the app was reading the right blobs to build the demo. I needed to blow away all the old blobs prepended with "Glancer" and also blow away all the new blobs prepended with "Glimpse" to make sure that site's crons would rebuild the site from an empty cache.