Minor Refactoring:
  - Changed main activity name to better reflect its intent
  - Extracted initializers into their own method
  - Updated UTs
Few more refactoring and removing unused code
Next round of refactor. Hook YouTubeVideosProvider to DreamPlay activity
and load the first round of videos using an AsyncTask to load regional
popular videos (using the actual Yt Data apis to load the real videos is
still TBD)