schema/ for code generation and opcuafundation.org files

cleanup .gitignore (wip)
orphan `HasModelParent` and `HistoricalEventConfigurationType` (tbr)

This addresses #88.
as long as it does not completely change for every small source change....

On 26 November 2014 at 20:44, Olivier Roulet-Dubonnet
<olivier.roulet@gmail.com> wrote:
> ok. that's fine for me.