* Remove condition_effects_prefer_not_to_say field
* Change reason type
* Remove prefer not to say from illness
* add majorrepairs,propcode and infer postcode
* Update previous location and la
* Update majorrepairs, national and reasonpref
* Update housing benefits fields
* rename file
* Add previous postcode
* Move inferred postcode to model
* refactor infered poscode method
* Remove unneeded import
* update miration and some mappings
* Remove duplicate migration command
Devise is a commonly used gem for user authentication and management. Using
rails generators and Devise allows us to get a lot of boilerplate code for
user authentication and management and means we don't have to revinvent the
wheel. Styling will need to be done for the necessary pages and there are
likely to be bits of generated code that can be deleted. This will act as
a starting point to be built up from using TDD.