mege
Combine-Backend-1

For presentation stage 2
validation1
validate add students
Merge remote-tracking branch 'origin/mele'

Conflicts:
	Documentations/presentation 2.pptx
	Web App/bea/_class/database.php
	Web App/bea/admin/editstaff.php
	Web App/seini/_class/_notes/dwsync.xml
	Web App/seini/logout.php
	Web App/seini/staffs.php

add by shell