Revert "Merge branch 'new-navigation-prototype' into 'master'"

app/assets/javascripts/sidebar.js.coffee

app/assets/stylesheets/framework/gitlab-theme.scss

app/assets/stylesheets/framework/header.scss

app/assets/stylesheets/framework/sidebar.scss

app/views/layouts/_collapse_button.html.haml

app/views/layouts/_page.html.haml

app/views/layouts/nav/_admin.html.haml

app/views/layouts/nav/_dashboard.html.haml

app/views/layouts/nav/_group.html.haml

app/views/layouts/nav/_profile.html.haml

app/views/layouts/nav/_project.html.haml

features/groups.feature

features/project/project.feature

features/steps/group/milestones.rb

features/steps/groups.rb

features/steps/project/active_tab.rb

features/steps/project/fork.rb

features/steps/project/project.rb

features/steps/shared/project_tab.rb