[Fiware-miwi] Updating OpenSpecification and OpenSpecification APIs

["Lasse Öörni"]

> I check more if can however edit the refs etc according to the
> suggestions. Lasse or anyone do feel free too if get a good idea.
>
>
> ~Toni

Well, I went ahead and removed "realXtend" from the Synchronization GE
docs as suggested. Now the scene model is in places referred to as
Entity-Component-Attribute scene model, which is not fully unambiguous, as
there are several different kinds of entity/component-based scene models
in different game engines etc.

-- 
Lasse Öörni
Game Programmer
LudoCraft Ltd.