Cookie date is now updated instead of using cache variable.
Logout changed to reflect this.
Slight refactor of AuthenticatingController.
Remove some gubbins
Merged master and refactored Authenticating Controller
Added key value declaration to hashmap diamond
Enforced same date format as DM when updating cookie
Merge pull request #107 from alphagov/cookie_update_last_used

Cookie update expiration date when used (24hours)