Added builds view

CHANGELOG

app/assets/javascripts/shortcuts_navigation.coffee

app/controllers/projects/builds_controller.rb

app/helpers/gitlab_routing_helper.rb

app/helpers/projects_helper.rb

app/helpers/runners_helper.rb

app/models/ability.rb

app/models/ci/runner.rb

app/views/help/_shortcuts.html.haml

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

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

app/views/projects/builds/_build.html.haml

app/views/projects/builds/index.html.haml

config/routes.rb

spec/features/builds_spec.rb