Change wording on home page

- We shouldn't make any reference to a date
- We should use the word 'completed' instead of 'submitted', to match
  the wording used on the summary page
Merge pull request #42 from alphagov/change-completed-wording

Change wording on home page
Tried to use flash.put to pass in validation
Added new validation messages to page 1, 2 3 and 4
Added cookie authentication to all controllers + check supplier ids match owner
Testing system variables
Removing authentication for testing
Disabling tests......
System props not working...broken deploy
Adding cookie configuration to appengine as system property
Update environment script now allows you to pass in cookie encrytion code as a 2nd param
Revert DM login url + authenticator reads enc key if specific in GAE system properties
Add default cookie path
Changed check to see if enc system var exists
SSOCookie will now become inactive after 24hours
Security update: User does not have to reauthenticate if they last used the app less than an hour ago - even if cookie is old
Added logout functionality
Allow cookies from digitalmarketplace url
Added class to get correct DM Url based on enivronment + legacy versions
Dropped cookie Authentication for ssp-preview environment