Merge branch 'ui-improvements' into 'master'

app/assets/stylesheets/gl_bootstrap.scss

app/assets/stylesheets/sections/admin.scss

app/assets/stylesheets/sections/dashboard.scss

app/assets/stylesheets/sections/header.scss

app/assets/stylesheets/sections/merge_requests.scss

app/assets/stylesheets/themes/ui_color.scss

app/models/merge_request.rb

app/views/admin/dashboard/index.html.haml

app/views/admin/groups/index.html.haml

app/views/admin/users/index.html.haml

app/views/devise/sessions/new.html.haml

app/views/profiles/emails/index.html.haml

app/views/projects/commits/_head.html.haml

app/views/projects/issues/_head.html.haml

app/views/projects/merge_requests/_form.html.haml

app/views/projects/merge_requests/_merge_request.html.haml

app/views/projects/merge_requests/_show.html.haml

app/views/projects/merge_requests/branch_from.js.haml

app/views/projects/merge_requests/branch_to.js.haml

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