WMTS MatrixHeight fix for GoogleMapsCompatible WellKnownScaleSet

bug fix of GoogleMapsCompatible (urn:ogc:def:wkss:OGC:1.0:GoogleMapsCompatible) WellKnownScaleSet, it also might concerns the googlecrs84quad

quote from [WMTS standard](http://portal.opengeospatial.org/files/?artifact_id=35326)
> … Level 0 allows representing the whole
world in a single 256x256 pixels. The next level represents the whole world in 2x2 tiles
of 256x256 pixels and so on in powers of 2. …

and compare with http://maps.wien.gv.at/wmts/1.0.0/WMTSCapabilities.xml