Provide more information to print services.

WMS Layer z-order and opacity.
The full list of OL map geometry parameters:
	geographic extent,
	geographic center point,
	map scale denominator,
	map resolution (px per ground unit),
	map projection,
	image size.
Fix WMS legends to be more complient with spec.

In particular, handle WIDTH and STYLE parameters and avoid passing
unnecessary parameters.
Remove trailing comma.
Merge pull request #8 from klassenjs/better_printing

Better printing
Merge pull request #9 from klassenjs/better_wms_legends

Fix WMS legends to be more complient with spec.
Fixed issue with USNG error when USNG is not included
added scale smart catalog directives, refs: #7
Merge branch 'master' into visible_layers_extension