added Google Maps functionality to the shows view

* @todo: Move this logic to the shows controller.
updated artists page to use new database structure

* '"services": { <service.name>: <service.id>, . . . }' works better
* than '"services": [ { "name": <service.name>, "id": <service.id> }, .
* . . ]'.
re-enabled HTML5 links mode (presumably for good this time)