Nazneen : Refactored the way product information is passed from grid view layout to full image activity.
Abhinav/Nazneen: Improved Logging, Made text colors non-readable.
Nazneen: Added a progress dialog when the images are being fetched for the grid view.
Nazneen: Implementing callback mechanism.
Nazneen: Downloading images in background.
Abhinav : Implemented Caching.
Abhinav: Added the external storage functionality.