Backported WMS GetLegendGraphic support for LayerGroups
Removing redundant info about assigning admin to workspaces and layers
using direct reference to Catalog to avoid startup race condition
Merge branch '2.2.x' of github.com:geoserver/geoserver into 2.2.x
Clarifying the difference between Read/Write/Admin
Merge pull request #102 from mbarto/2.2.x_getlegendgraphic_layergroups

Backported WMS GetLegendGraphic support for LayerGroups