added 'action' table header to properties files
Merge pull request #120 from ccancellieri/2.2.x-fix-wms-reference-doc

fix wms reference documentation merge
[GEOS-5541] Invalid WFS Layer Preview entry
[GEOS-5534] GetFeatureInfo templates don't work when layer has more than 20 class breaks
GEOS-5599 GetLegendGraphic doesn't correcly render symbols bigger than icon requested size
JSON WFS adding simple json mime type response handler (backward compatibility)