Tidy up gemspec & remove some crufty old files
Oops, fix typo
Increase min-width of unselected path elements
Speed up site map loading

- Monitor iframe path changes to launch map load before iframe is fully loaded
- Add a JS data cache to enable & handle 304 responses
Tidy up gemspec & remove some crufty old files
Increase min-width of unselected path elements
Merge branch 'map_load_optimisation'