Added maximumAge param to LocationManagerModel.getLocation()
Added link to re-lookup geolocation and pubsub handling to allow passing the new location to otherviewmodels in the page
Fixed bugs in NearbySightingListViewModel.js so that the beer detail nearby sighting list works again
Hooked up PubSubJS and update location navbar links for nearby sightings view
More of the previous beer detail location fixes
navbar update location link rotates when location is updating.  Listens for other viewmodels to publish geolocation start and success messages.
Hooked add sighting view into navbar geolocation update button
Add sighting view now animates navbar geolocation icon when getting location