Remove overloading.py
Remove overloading.py

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