Make the Crs type hashable.
Make the Crs type hashable.

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