Change port number to 8080
Change port number for live reload to 8988
Revert "Add code for simple_form", "Add gems for simple_form", "Add assets for bootstrap" and "Add gems for bootstrap"

This reverts commit 9d322df409bfb92b3fd3c3ca2e2d466dc0eaddae, 8901bc0424d4052145dbd24a09beac03a3c89a8e, 404d49edbc6371558c8ea55b7f6c3d04b14d640b, c6be98a0be673b74cd559e5b22df5ec7d4199e90.
Add gem for bootstrap-sass
Polish UI in home page and header
Add jquery.turbolinks
Support focusing the current menu to be highlighted
Remove unused navbar item
Add about view
Fix an issue on navbar menu to be focused
Slightly modify logo design
Replace <a> elements with link_to representations
Add admin flag to user model
Enable bootstrap's dropdown
Support user name to be used for sign up/in
Fix incorrect design for alert
Change path for signing up/in/out
Change HTTP method for signing out to use 'get' instead of 'delete'
Polish devise views with bootstrap