Changes in fragment of DeleteUser activity
Spinner in FragmentDelete populated with users
Delete button pressed now pops up an alert

	AlertFragment has got a function wherein you can
	pass your own preference of title and messages
	for alert dialog box
Changed way of implementing delete alert
Delete button is now functional

	* Alert has been implemented in FragmentDelete itself
	* DialogAlert fragment is not used for the time being
Major changes made in interface of add and edit

	* Add and Update now open up to dialogboxes instead
	  of fragment for entering username and password
	* DialogAlert implements it and is called from UserDatabase
	* FragmentEdit is useless for now
Show password checkbox now functional in dialog box
Empty username will not be saved
Merge branch 'varun' into tanjot
Login password not available

	Made a check at login if password is not available
Moved UserStructure out of directory 'ui'