Added delete button to snippet view

app/views/snippets/_blob.html.haml

@@ -6,6 +6,7 @@
       .btn-group.tree-btn-group.pull-right
         - if @snippet.author == current_user
           = link_to "Edit", edit_snippet_path(@snippet), class: "btn btn-tiny", title: 'Edit Snippet'
+          = link_to "Delete", snippet_path(@snippet), method: :delete, confirm: "Are you sure?", class: "btn btn-tiny", title: 'Delete Snippet'
         = link_to "Raw", raw_snippet_path(@snippet), class: "btn btn-tiny", target: "_blank"
   .file_content.code
     - unless @snippet.content.empty?