Added form for entering parameters
Added forms helper
Changed DateField import to come from wtforms.fields.html5
Fixed up redirect after submission of generate premium form
This doesn't currently generate anything or enter anything to the db
Added email validation and default email address
Added default start date for contract to be the first day of the next calendar month
Created dummy premium for insertion into database
Added cancel button to generate premium template
Added return to customer list button to display customer
Added generate button to display customer template