Support nested layers and SRS lists (#138)
Support nested layers and SRS lists (#138)

QuLogic/OWSLib,bird-house/OWSLib,datagovuk/OWSLib,kalxas/OWSLib,datagovuk/OWSLib,daf/OWSLib,jaygoldfinch/OWSLib,dblodgett-usgs/OWSLib,gfusca/OWSLib,jachym/OWSLib,robmcmullen/OWSLib,ocefpaf/OWSLib,geographika/OWSLib,datagovuk/OWSLib,JuergenWeichand/OWSLib,jaygoldfinch/OWSLib,tomkralidis/OWSLib,Jenselme/OWSLib,mbertrand/OWSLib,daf/OWSLib,menegon/OWSLib,KeyproOy/OWSLib,daf/OWSLib,geopython/OWSLib,kwilcox/OWSLib,b-cube/OWSLib