Axis order reporting for bbox-crs too

[aaime]

Returning a header with an indication of the axis order along with items responses is useful, but does not complete the picture, a client seems to have no way to figure out if its local understanding of the CRS order matches the one used by the server... which is critical to setup a proper bbox specification, no? I checked the core spec, it's just talking about axis1 and axis2 without giving them a direction, so it seems the ordering is still left up to the extension.