add flash messages for user login
log in a new user on profile creation
scope all user functionality to current_user
Merge pull request #36 from lisavogtsf/master

adds container and row divs to application.html for bootstrap styling of...
fix merge conflice in site/index
Merge pull request #37 from cameronjacoby/master

add flash messages for user login; log in a new user on profile creation; scope all user functionality to current_user
add nav logic based on session id
Merge pull request #38 from cameronjacoby/master

add nav logic based on session id