Fix Datatables sort images not working in Rails

datatables_sort_image_fix.md

Fix the sort images not working by editing jquery.dataTables.css

1. Rename jquery.dataTables.css to jquery.dataTables.css.erb
2. Update the image paths like below

table.dataTable thead .sorting {
  background-image: url(<%= image_path("sort_both.png") %>);
}
table.dataTable thead .sorting_asc {
  background-image: url(<%= image_path("sort_asc.png") %>);
}
table.dataTable thead .sorting_desc {
  background-image: url(<%= image_path("sort_desc.png") %>);
}
table.dataTable thead .sorting_asc_disabled {
  background-image: url(<%= image_path("sort_asc_disabled.png") %>);
}
table.dataTable thead .sorting_desc_disabled {
  background-image: url(<%= image_path("sort_desc_disabled.png") %>);
}