add user login, user create, user destroy, user view own profile, index page now welcomes a user when signed in and gives option to go to own profile; if session cookie is nil then index page will ask for sign in or to create a new profile; user model modified to accommodate password authenticate
gemfile back to 2.1.2
Merge branch 'rob01'
Merge pull request #9 from unknownbreaker/master

Rob user sessions