Fix #119 - Servers updated if older than 3 days.
Fix #119 - Removed dialogs and toasts when the server list is updated in
the background or the auto-detected server is the same than before and
the update process was not requested by the user.
Fix #119 - Minimum move distance to trigger server selection was too
little.
Merge branch 'master' of https://github.com/CUTR-at-USF/OpenTripPlanner-for-Android into issue119
Fix #119 - Moved to OTPApp constant of expiration days limit for servers
list.
Merge pull request #126 from vreixo/issue119

Fix #119 - Servers updated each 3 days in the background.