If there's a library.xml file next to the qmldir file, Creator will
read that instead of trying to run qmldump on the library.

Reviewed-by: Erik Verbruggen

Reviewed-by: Erik Verbruggen

Determining the mime type is too expensive - and for deciding between
qml and js files comparing suffixes is sufficient.

Reviewed-by: Friedemann Kleint

Task-number: QTCREATORBUG-2607
Reviewed-by: Erik Verbruggen

Task-number: QTCREATORBUG-3047
Reviewed-by: Erik Verbruggen

Getting the QmlJsModelManager working stand alone
for auto testing

Reviewed-by: Christian Kamm

Reviewed-by: Thomas Hartmann