Improve tree view for mobile

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

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

@@ -5,4 +5,4 @@
       = link_to blob_item.name, project_blob_path(@project, tree_join(@id || @commit.id, blob_item.name))
   %td.tree_time_ago.cgray
     = render 'spinner'
-  %td.tree_commit{ colspan: 2 }
+  %td.hidden-xs.tree_commit{ colspan: 2 }

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

@@ -11,5 +11,4 @@
       - else
         = link_to "#{submodule_item.id[0..10]}", commit
   %td
-  %td
-  %td
+  %td.hidden-xs

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

@@ -20,7 +20,7 @@
       %tr
         %th Name
         %th Last Update
-        %th.hidden-sm
+        %th.hidden-sm.hidden-xs
           Last Commit
           %span.last-commit
              
@@ -30,15 +30,14 @@
               = link_to @commit.short_id, project_commit_path(@project, @commit)
               –
               = truncate(@commit.title, length: 50)
-        %th= link_to "history", project_commits_path(@project, @id), class: "pull-right"
+          = link_to "history", project_commits_path(@project, @id), class: "pull-right"
     - if @path.present?
       %tr.tree-item
         %td.tree-item-file-name
           = link_to "..", project_tree_path(@project, up_dir_path(tree)), class: 'prepend-left-10'
         %td
-        %td
-        %td
+        %td.hidden-xs
     = render_tree(tree)

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

@@ -5,4 +5,4 @@
       = link_to tree_item.name, project_tree_path(@project, tree_join(@id || @commit.id, tree_item.name))
   %td.tree_time_ago.cgray
     = render 'spinner'
-  %td.tree_commit{ colspan: 2 }
+  %td.hidden-xs.tree_commit{ colspan: 2 }