Sanitise response from the Foursquare API; preventing numerous PHP warnings if the API is down or returns an invalid response.
Up plugin version number to v1.3.1. Add support for caching last good checkin metadata to fallback on if the Foursquare API is down.
Add support for [wpq_locality] shortcode. Add reverse geocoding (and caching) via Factual's API for when the 4Square API response doesn't contain all venue metadata. Make shortcode use configurable.
Ensure cache is deleted property on plugin uninstall.