setProp = function (prop, propVal) {
			_extTypes[prop][name] = propVal;
		}
Helpers for `columns.render`.

The options defined here can be used with the `columns.render` initialisation
option to provide a display renderer. The following functions are defined:

* `moment` - Uses the MomentJS library to convert from a given format into another.
This renderer has three overloads:
  * 1 parameter:
    * `string` - Format to convert to (assumes input is ISO8601 and locale is `en`)
  * 2 parameters:
    * `string` - Format to convert from
    * `string` - Format to convert to. Assumes `en` locale
  * 3 parameters:
    * `string` - Format to convert from
    * `string` - Format to convert to
    * `string` - Locale
* `number` - Will format numeric data (defined by `columns.data`) for
  display, retaining the original unformatted data for sorting and filtering.
  It takes 5 parameters:
  * `string` - Thousands grouping separator
  * `string` - Decimal point indicator
  * `integer` - Number of decimal points to show
  * `string` (optional) - Prefix.
  * `string` (optional) - Postfix (/suffix).
* `text` - Escape HTML to help prevent XSS attacks. It has no optional
  parameters.

@example
  // Column definition using the number renderer
  {
    data: "salary",
    render: $.fn.dataTable.render.number( '\'', '.', 0, '$' )
  }

@namespace