Threading and Layout Updates
* Changed the way the threading is done: from having a runnable with a timer to
  having a timer send a post request to a handler
* Drive uploading no longer extends activity, it is now simply a class with
  methods called by the service
* Added duration to the collected data and made the date human readable
* Added a background Karan created to the main screen
* Made the Google Sign in button hidden (it will probably be modified for a new
  use soon)
* Added color changes to the app tracking button

*** Coming soon! ***
* Integration with a script to analyze the data in drive
* More UI updates and new analysis features!