GEOS5620 WMS-EO - created page to add EO layers
Remove xerces dependency still getting in via old JTS from GWC
[GEOS-5597] GWC_DISKQUOTA_DISABLED not respected
[GEOS-5634] enabling 'disk quota' causes disk quota page to bug-out, and [GEOS-5633] Disk quota never goes down
Clean up the old quota store when disabled, the stats are othewise going out of synch as gwc is used while the quota store is disabled
GEOS5620 WMS-EO - improved group creation page and added delete group page
Merge pull request #147 from svzdvd/GEOS5620-wmseo-4

WMS-EO changes
Merge branch 'master' of https://github.com/geoserver/geoserver into master-upstream