Fix warning
Fix crash when getting EnginioReply
Change order of parameters for setValue

In listmodel and other places the role comes first,
then the value, see for example:
http://qt-project.org/doc/qt-5.0/qtqml/qml-qtquick2-listmodel.html
Rename setValue to setProperty

This aligns the api with QQmlListModel.
Fix crash: not all requests are made by one model

Having two models would crash before.