Experimenting with adding new model classes and views

 On branch master
 Changes to be committed:

	new file:   app/model/lease.py
	modified:   app/templates/appl.html
	new file:   app/templates/investors.html
	new file:   app/templates/lease.html
	new file:   app/view/lease.py
	modified:   app/view/overview.py