Revert "Add last commit time to repo view"

This reverts commit 8581e152.

This creates really difficult conflicts with another MR that was
worked on simulataneously. That MR mostly encompassed the aims of
this commit.

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5308/commits

app/assets/stylesheets/pages/tree.scss

@@ -11,16 +11,6 @@
     }
   }
 
-  .last-commit {
-    max-width: 506px;
-
-    .last-commit-content {
-      @include str-truncated;
-      width: calc(100% - 140px);
-      margin-left: 3px;
-    }
-  }
-
   .tree-table {
     margin-bottom: 0;
 

app/views/projects/tree/_tree_content.html.haml

@@ -5,17 +5,16 @@
         %tr
           %th Name
           %th Last Update
-          %th.hidden-xs.last-commit
-            Last Commit
-            .last-commit-content.hidden-sm
+          %th.hidden-xs
+            .pull-left Last Commit
+            .last-commit.hidden-sm.pull-left
+               
               %i.fa.fa-angle-right
                
               %small.light
                 = link_to @commit.short_id, namespace_project_commit_path(@project.namespace, @project, @commit), class: "monospace"
                 –
-                = time_ago_with_tooltip(@commit.committed_date)
-                –
-                = @commit.full_title
+                = truncate(@commit.title, length: 50)
             = link_to 'History', namespace_project_commits_path(@project.namespace, @project, @id), class: 'pull-right'
 
       - if @path.present?