Move all stuff to groups controller

app/assets/stylesheets/sections/projects.scss

app/controllers/dashboard_controller.rb

app/controllers/groups_controller.rb

app/views/dashboard/_groups.html.haml

app/views/dashboard/index.html.haml

app/views/groups/_projects.html.haml

app/views/groups/issues.atom.builder

app/views/groups/issues.html.haml

app/views/groups/merge_requests.html.haml

app/views/groups/people.html.haml

app/views/groups/search.html.haml

app/views/groups/show.atom.builder

app/views/groups/show.html.haml

app/views/groups/show.js.haml

app/views/layouts/group.html.haml

config/routes.rb