add active admin for user and submission resources
admin panel has submissions page with links to documents and a grid display of images
fixed admin user fixtures
admin related actions removed from users controller
cleaned up submissions controller
Merge branch 'master' of github.com:aomra015/vvapp into add-admin
cleanup routes, controllers and tests - removing admin capabilities from user facing side. Admin stuff only in the admin namespace
non pdf/doc documents are not stored
Merge branch 'master' of github.com:aomra015/vvapp