add StaticPages controller
add static pages: home, help, about
Merge branch 'feature/static_pages' into develop
DRY static pages
add full_title in application_helper
fill in layout
dry path and spec tests
add sign up page
Merge branch 'feature/filling_in_layout' into develop
change have_content to have_selector
add shared_examples in rspec
use full_title of ApplicationHelper in test
add link to sign up page in header