add isdimension
add isdimension

quantopian/datashape,ContinuumIO/datashape,cpcloud/datashape,ContinuumIO/datashape,aterrel/datashape,llllllllll/datashape,blaze/datashape,quantopian/datashape,llllllllll/datashape,cpcloud/datashape,aterrel/datashape,blaze/datashape,cowlicks/datashape,cowlicks/datashape