updated polyfill to use jquery plugin

fixes #257
Extract access details mailing functionality into a service
Adds a memorable word form into the application process
Merge branch 'master' of github.com:ministryofjustice/atet
remove additional email fields on review page
Updates the user session controller for returning a user to an application & also for providing a reminder of the application number. Memorable word form has now be switched for application number form, this is now the first step in the claim application process.
Rename application form spec
Tidy up routes file
Don’t use truthy/falsey matchers when true and false are returned
Split the custom validations into two distinct validations for user sessions
Adds callbacks to the form class. Includes helper for before and after callbacks on save
Implements the form callbacks on the application number form
Merge pull request #274 from ministryofjustice/change_urls

Change urls
changed acas boolean to a gds_check_boxes type
minor restruscture to respondent page
Merge pull request #238 from ministryofjustice/fixes/issue-167

Fixes/issue 167
Merge pull request #258 from ministryofjustice/fixes/gh-issue-257

updated polyfill to use jquery plugin
removed comments. Still need to reject blanks as unchecked checkboxes still return empty strings
Merge pull request #272 from ministryofjustice/remove_email_address_fields

remove additional email fields on review page
fixed merge conflicts