Fix tree css class conflict

app/assets/stylesheets/main.scss

@@ -136,7 +136,7 @@ $hover: #FDF5D9;
 /**
  * Code (files list) styles. Browsing project files there 
  */
-@import "tree.scss";
+@import "sections/tree.scss";
 
 /**
  * This file represent notes(comments) styles 

app/views/refs/_tree_item.html.haml

@@ -13,10 +13,10 @@
     - else
       = image_tag "file_dir.png"
     = link_to truncate(content.name, :length => 40), tree_file_project_ref_path(@project, @ref || @commit.id, file), :remote => :true
-  %td.cgray
+  %td.tree_time_ago.cgray
     = time_ago_in_words(content_commit.committed_date)
     ago
-  %td.commit
+  %td.tree_commit
     - tm = @project.team_member_by_name_or_email(content_commit.author_email, content_commit.author_name)
     - if tm
       %strong= link_to "[#{tm.user_name}]", project_team_member_path(@project, tm)