Delete duplicate /lib and add a new post route to /login to redirect user to index page

Add  a new POST route to /login so that we'll redirect a user request to /index page, regardless of whether a user account exists in our DB or not.  After this change, I'll add a logic to display a user to module specific page based on whether user account exists in DB or not.

@krulwich, @suprbh, @ceg1236 - please review.