Updated SLD cookbook 3-color gradient to match current behavior
[GEOS-6785]WCS GetCapabilities 1.1.1 has invalid metadataType attribute

WCS GetCapabilities request had a metadataType attribute which isn't allowed according to the XSD (owsCommon 1.1.1). Thus I have removed this item from being generated.
Merge pull request #833 from Geodan/GEOS-6785

[GEOS-6785]WCS GetCapabilities 1.1.1 has invalid metadataType attribute
Merge pull request #815 from tbarsballe/sldcookbook

Updated SLD cookbook 3-color gradient to match current behavior
Merge branch 'master' of git://github.com/geoserver/geoserver