UX improvements

• make atom feed on commits page smaller so it capture less attention
• open big image 400px instead of default 40px when click on user avatar

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

@@ -15,7 +15,7 @@
       Create Merge Request
   - if current_user && current_user.private_token
-    = link_to namespace_project_commits_path(@project.namespace, @project, @ref, {format: :atom, private_token: current_user.private_token}), title: "Feed", class: 'prepend-left-10 btn' do
+    = link_to namespace_project_commits_path(@project.namespace, @project, @ref, {format: :atom, private_token: current_user.private_token}), title: "Commits Feed", class: 'prepend-left-10 btn' do
       = icon("rss")