Done list:
 - Remove Setting Menu.
 - Add Info Menu.
 - Add Story Menu (play Youtube video, need to install Youtube app in
emulator.)
   => To install app in AVD, locate the folder
.\android-sdk\platform-tools\, open command prompt, and type
     adb install [path_to_the_apk_file]
 - Fix Shop Menu: now with option to purchase for candies. User's total
candies change after transactions.
 - Remove some unused resources.

To do:
 - Save user's data after transaction
 - Online purchase (real money)