Adding note about ubuntu, reorganizing
Adding note about ubuntu, reorganizing

gravitystorm/carto,1ec5/carto,tomhughes/carto,clhenrick/carto,mapbox/carto,whitelynx/carto,midnightcomm/carto,CartoDB/carto,stefanklug/carto,madeinqc/carto,pnorman/carto,CartoDB/carto