Simple changes to default settings

Few simple changes to default settings to demonstrate useful options and
follow recommended settings.

  - installLocation set to preferExternal
  - screenOrientation set to portrait
  - configChanges set to capture changes to keyboard and screen
  - hide status bar on Android devices
  - use OpenGL ES 1.x instead of 2.x

For reference see http://code.google.com/p/libgdx/wiki/ApplicationConfiguration