fix.fixed title of about page.
add.add contact page.
mod.enable guard and spark.
mod.add full_title.
mod.modify application.html.erb.
mod.modify home.html.erb.
mod.add bootstrap.
add.add css.
add.add partials.
mod.user sass format and variables.
mod.modify routes.
mod.modify tests.
add.add sign up page.