Added support for spatial references
Added support for spatial references

 - Added ToGeometry extension method overload with an ISpatialReference parameter
 - Original ToGeometry extension method uses a default projected coordinate system (Plate Carree) spatial reference with low precision so that, in the case of simple integer coordinates as commonly used in test cases, the original coordinates are preserved when converting from WKT to IGeometry.

blah238/DnrGps_Wkt