change links
show logout link only when user has logon
include bootstrap
style of layout
add a navbar to layout
new login form
new register form
use form_for and form_tag
change alert to notice
add basic validations
use jumbotron for showing welcome
bugfix: delete attr_accessor
only calculate and replace login time
adjust the margin of links in jumbotron
show username when user has logon
delete some notice