Added the staggered grid view into the main screen
Created the adapter and the layout for the stories
Fixed a bug which after the user has logged out, the Parse user is still linked.
Created the first version of the database to save the data locally
Added the launch icon. Deleted the content of the table when the user exists
Renamed the method to create the tables
Modified the insert method of the database by insertOrUpdate. This will avoid problems when refresh
Merge branch 'retrieveUserStories'