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
Merge branch 'master' into gwc-url-mangling-master
replaced hardcoded geoserver version number.
Fixed version number reference to follow the project convention.
Add Web 3D Service as a community module.
Add group.id to w3ds pom. Add w3ds as a profile in web app.
GEOS5547 - GSIP84 - LayerGroup: added Mode, RootLayer and RootLayerStyle. Updated WMS GetCapabilities and GetMap
fixed docguide URL from translation page
[doc] changed shapefiles url to git master branch
GEOS5547 - fixed backward compatibility for serialized layer groups
GEOS5547 - fixed PreviewLayerProvider
Merge pull request #96 from nmco/master

W3DS service as a community module
Fix test expectations on error message
Merge branch 'master' into gwc-url-mangling-master
Merge pull request #53 from smithkm/gwc-url-mangling-master

[GEOS-3847/GEOS-5359] Integration with GWC Pluggable URL Mangling
i18n for ReporojectPage 'show transformation details' link
ensure ServiceInfo.geoServer member initialized when loading
Merge pull request #103 from fgdrf/webdemo-i18n

Fix for minor localization issue in web-demo ReprojectPage