- updated custom CSS;

- added Fleet Fueling module;
- fixed an issue with active menu being stuck for some reason;
- updated FuelOrder entity to support Fleet Fueling;
- LabelHelpers class is being replaced with MvcHtmlHelpers;
- added classes to support abstraction of search model classes (for pagination)
- updated text on PagingInfo labels;
- moved customer retrieval to CustomerRepository;
- updated headers of Orders table.