deleted the user mailer which would send a welcome email to registered users, modified the error handling in the application.html.haml
used the dropdown menu on the navbar
fixed the signup problem
before fixing the functionality of updating category
redo the nav bar showing the logged in user
fixed the problem
1. Added a view for showing post
2. modified the routing, added resources: posts, splitted the nested
route into two spereate nested routes
3. modified the home link in the nav-bar, before signed in or signed up,
it redirects to the home page, otherwise, redirects to posts#index view
Fixed the alert message for successfully posting a message
using bootstrap-will_paginate to do paging