Offline mode is online

* removed the daylight icon
* added settings icon
* updated HabitatFont with 1 new glyph
* the daylight option was moved to the settings page
* the app will now store the latest position data and use
  it when network is not available.
* added loading bar at starta (indicating applicationCache progress)
* added option to force refresh applicationCache
* added option to have station placed on the map as well as
  a chase car
* updated README