integration with gitlab auth

app/controllers/ci/application_controller.rb

app/controllers/ci/builds_controller.rb

app/controllers/ci/commits_controller.rb

app/controllers/ci/projects_controller.rb

app/controllers/ci/user_sessions_controller.rb

app/helpers/ci/commits_helper.rb

app/models/ability.rb

app/models/ci/user.rb

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

app/views/ci/builds/show.html.haml

app/views/ci/commits/_commit.html.haml

app/views/ci/commits/show.html.haml

app/views/ci/projects/_gl_projects.html.haml

app/views/ci/projects/gitlab.html.haml

app/views/ci/projects/show.html.haml

app/views/ci/user_sessions/show.html.haml

app/views/layouts/ci/_info.html.haml

app/views/layouts/ci/_nav.html.haml

app/views/layouts/ci/project.html.haml

lib/ci/api/projects.rb