Merge changes Icf6fafe9,I35eb3f0c,Ieec0c486,I8accb164 into pi-dev

* changes:
  Set color of update line to red if update is older than six hours.
  In Data Usage screen, Below the data bar, Add “X days left” field.
  In Data Usage screen, add over-limit state.
  Change text layout of data usage string.