changed default zoom; fixed sort and geolocation

Resolves 
https://github.com/trailheadlabs/OpenTrails-Mobile/issues/14
https://github.com/trailheadlabs/OpenTrails-Mobile/issues/12

Should mostly resolve
https://github.com/trailheadlabs/OpenTrails-Mobile/issues/20
See http://community.phonegap.com/nitobi/topics/geolocation-not-working-on-ios-8
Phonegap build still hasn't got the geolocation plugin fully working. This should work but will ask for always permission when we just need while running. Hopefully, they will fix this soon. It seems a lot of people are awaiting on them.