Meto los cambios que me faltaban
	modified:   CygnusCloud/controllers/administrator.py
	modified:   CygnusCloud/controllers/main.py
	modified:   CygnusCloud/controllers/student.py
	modified:   CygnusCloud/static/css/default.css
	new file:   CygnusCloud/static/images/image03.jpg
	new file:   CygnusCloud/static/images/image04.jpg
	modified:   CygnusCloud/views/layout.html