ROIGeometry fails to replace ROIShape in a number of methods

[aaime]

Basically it fails every time it throws a UnsupportedOperationException, making it not a good replacement for ROIShape. I've found out this trying to replace all ROIShape in GeoTools with ROIGeometry and got myself in... troubles :-p Also, even without those changes, OSX native JAI seems to call ROIGeometry methods we don't support (get as rectangle list) making the build fail on OSX with its own native JAI (which is different than the stock one, it's OSX specific).

Already working on this btw.