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
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
fix for GEOS-5563 (mixed order of X and Y Transformation parameters
GEOS-5557 Enhance API for GeoserverUserGroupService
GEOS-5558 Integrating the AuthKey module into the new security architecture
GEOS-5565, using workspace admin authorizier on sql view pages
using initdb rather than import to determine if init scripts should be copied over
GEOS-5565, using workspace admin authorizer for create new feature type pages
Merge branch 'master' of https://github.com/geoserver/geoserver