Proper class names for diff files

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

app/assets/stylesheets/sections/commits.scss

@@ -10,11 +10,11 @@
   }
 }
 
-.file {
+.diff-file {
   border: 1px solid #CCC;
   margin-bottom: 1em;
 
-  .header {
+  .diff-header {
     @extend .clearfix;
     background: #DDD;
     border-bottom: 1px solid #CCC;
@@ -46,7 +46,7 @@
       font-family: $monospace_font;
     }
   }
-  .content {
+  .diff-content {
     overflow: auto;
     overflow-y: hidden;
     background: #FFF;

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

@@ -44,8 +44,8 @@
       - file = project.repository.blob_at(@commit.id, diff.new_path)
       - file = project.repository.blob_at(@commit.parent_id, diff.old_path) unless file
       - next unless file
-      .file{id: "diff-#{i}"}
-        .header
+      .diff-file{id: "diff-#{i}"}
+        .diff-header
           - if diff.deleted_file
             %span= diff.old_path
 
@@ -70,7 +70,7 @@
                 %span.commit-short-id= @commit.short_id(6)
 
 
-        .content
+        .diff-content
           -# Skipp all non non-supported blobs
           - next unless file.respond_to?('text?')
           - if file.text?