plug in the url manglers with gwc's hook

GWC now has a hook for altering the urls that it generates. This plugs
into that hook, and delegates to the geoserver response utils chain,
which calls all the geoserver pluggable extensions.
added WMS and WMTS support for URL mangling
Fix for URL mangling base paths, and adding WMS and WMTS mangling
Add GeoScript to the Groovy Script module
Merge branch 'master' of git://github.com/geoserver/geoserver into script_groovy
Add license headers
Fix failing test
Merge branch 'master' into gwc-url-mangling-master
replaced hardcoded geoserver version number.
GEOT-4358: added style test for isCoverage filter function
Added support for LayerGroup to the WMS GetLegendGraphic action
import geoscript's geometry class
wfs capability extension point

Added an extension point for adding wfs capability extension elements
Added wfs inspire extension which demonstrates the use of said extension point.
Work is financed by IGN
Merge pull request #92 from jericks/script_groovy

Add GeoScript Groovy to the Community Groovy Script Module
added groovy and javascript script modules to nightly community builds
fixed some bugs and added forceTitles legend option
Fixed typo in User Guide Rendering Transformation section
[GEOS-5539] Support raster custom dimensions generated at runtime
Merge pull request #86 from svzdvd/master-isCoverage

GEOT-4358: added style test for isCoverage filter function
Fixed version number reference to follow the project convention.