And also speed up /importer/TYPE page's query by saying it's unsorted, which
gets us a better index. Hacky workaround. Should fix it in the query planner
later instead.
Fixes#1105
Change-Id: I140ffb40456ec802844584568d2f1a7a38b26e41
Foursquare was rebranded Swarm (for check-ins) some time ago, so
rename our implementation to match the upstream branding. But still
store "foursquare" as the permanode importer type, to not break old
users. That override is now added to the new Properties struct, and
all importers now return their properties.
More stuff will be added to Properties later: WIP flag, bug link,
proper title, icon?
Change-Id: I31cbe2feec3dbf9c6bdb0c866056d9c6966313e3
Brad Fitzpatrick