#11 Ignore DTD option

[jkarretero]

It would be useful to add an "ignore DTD option" to the command-line parameters.

Sometimes people don't need the DTD file for a transformation and would like to ignore it.

For example, if doctype reffers to an online DTD file, you must be connected to internet to be able to process the xml, although you don't need the DTD.

Microsoft MSXSL does have that option (-xe).

Thanks for your work!