added subclass note to cartodb.cartodblayer.sublayer and cartodb.cartodbhttpsublayer descriptions
added subclass note to cartodb.cartodblayer.sublayer and cartodb.cartodbhttpsublayer descriptions

johan--/cartodb.js,CartoDB/cartodb.js,johan--/cartodb.js,johan--/cartodb.js,CartoDB/cartodb.js,CartoDB/cartodb.js,CartoDB/cartodb.js,johan--/cartodb.js