Add lwgeom_from_geojson to liblwgeom, add cunit test, fix memory leak

git-svn-id: http://svn.osgeo.org/postgis/trunk@11119 b70326c6-7e19-0410-871a-916f4a2858ee
Fix parsing GeoJSON of multipolygon with holes (#2216)

git-svn-id: http://svn.osgeo.org/postgis/trunk@11120 b70326c6-7e19-0410-871a-916f4a2858ee
Add regression test for #2216

git-svn-id: http://svn.osgeo.org/postgis/trunk@11121 b70326c6-7e19-0410-871a-916f4a2858ee