Added all_deimsion_keys and changed key_attributes of a dim to be a property
Added all_deimsion_keys and changed key_attributes of a dim to be a property

ubreddy/cubes,noyeitan/cubes,jell0720/cubes,jell0720/cubes,pombredanne/cubes,noyeitan/cubes,pombredanne/cubes,cesarmarinhorj/cubes,noyeitan/cubes,jell0720/cubes,ubreddy/cubes,cesarmarinhorj/cubes,zejn/cubes,zejn/cubes,zejn/cubes,ubreddy/cubes,cesarmarinhorj/cubes,pombredanne/cubes