Add Backup-activity &permission to write in Sdcard
Link backup activity to menu
Send user to backup activity when requested
Make database name constant public
Add backup logic to datasource class
Backup layout & activity java class
Functionality for moving files
Backup activity layout file
Add an string for restoring indication
A class for coping files form a place to another

This class is taken from stackoverflow.
Add Backup and Restore functionality to datasource
Backup activity class

In this activity backup and restoring backed-up data will happen.
Also all backed-up data will be listed.
Remove backup file
Merge branch 'BackupRestoreFunctionality'