add bin/ to scm
add bootstrap-sass
modify universal css
add _ie.html.erb and modify application.html.erb to render special htmls for IE.
move header html to _header.html.erb and modify to render it in application.html.erb.
modify routing
bin/rails generate migration add_index_to_users_email
add bcrypt-ruby
update bin/*
executes "bin/rails g migration add_password_digest_to_users password_digest:string" and then "bin/rake db:migrate"
add user authentication functionality
Merge branch 'modeling_users'
Merge remote-tracking branch 'origin/filling-in-layout'

Conflicts:
	Gemfile
	Gemfile.lock
fix the unresolved conflict in Gemfile.lock