Subject: Some changes in access to master menus depending upon user role

Description:
1. Access to menus as per the role
	* Admin: All menus
	* Guest: All menus except rollover, user account settings
	* Manager: All menus Except delete org and rollover
	* Operator: All menus except rollover, delete org, bank recon, income-exp report, adding new user

2. In change username, edittext field was non-editable, fixed that.

3. Added updated images in README.rst