This adds a unit test that tests weather the projection (spatial reference)
is being added inside the geometry object when writing features as
esriJson.
The WFS transaction failed if the srsDimension was not present on the
geometries.
Unit tests have been changed to accomodate the srsDimension attribute.
Contrary to Mapserver, Geoserver sets the srsDimension attribute on
the child of the geometry node, not on the points list.
This fix searches that node as well.
A small unit test was also added.
As mentioned on issue 6992, EsriFormat was adding the spatial reference
outside the geometry, failing to insert data via the Arcgis rest API.
The spatial reference should be inside the geometry.
Joao Gouveia