Make sure proxy requests are properly treated as secure if applicable [MJ-588]

(Requires Nginx config change)

Also ensures that the user's session cookie is only sent over https connections
Merge branch 'master' into persist-https-on-nav-MJ_588
Merge pull request #369 from DirectEmployers/persist-https-on-nav-MJ_588

Persist https on nav [MJ-588]