remove ordering arrows because ugly and useless

app/views/datagrid/_head.html.haml

@@ -2,4 +2,3 @@
   - grid.html_columns(*options[:columns]).each do |column|
     %th{:class => "#{datagrid_column_classes(grid, column)}"}
       = column.header
-      = datagrid_order_for(grid, column, options) if column.supports_order? && options[:order]

app/views/datagrid/_order_for.html.haml

@@ -1,9 +0,0 @@
-.order
-  = link_to(                                                                                      |
-    I18n.t("datagrid.table.order.asc").html_safe,                                                 |
-    url_for(grid.param_name => grid.as_query.merge(:order => column.name, :descending => false)), |
-    :class => "asc")
-  = link_to(                                                                                      |
-    I18n.t("datagrid.table.order.desc").html_safe,                                                |
-    url_for(grid.param_name => grid.as_query.merge(:order => column.name, :descending => true )), |
-    :class => "desc")