add favicon
added endpoints:

  GET /login
    display a link to /auth/{provider}

  GET /info
    display the logged-in user info.
fix addAuth to tell mognoose auth is updated by markModified.
fix session.loggedIn handling and implement merge feature.
facebook auth
GET /info now supports 'b' parameter to redirect after the successfull login.
cleanup debug code
add case for ?b
log mongodb connection
add some design parts
Merge branch 'develop'