[AC] Tested destroy for colors, view for colors handles no attactched
value proposition
[AC] Must be logged in and an admin to view 'manage value propositions' and 'manage colors' pages
[AC] Must be logged in and an admin to view index pages for colors; value propositions index page redirects all users
[AC] Value proposition show & index pages more closely mirrors color show & index pages
[AC] Value proposition show & index pages more closely mirrors color show & index pages