Use unsigned long long in protocol (#251)
Use unsigned long long in protocol (#251)

This appears to be platform independent at 8 bytes long

Fixes #250
dask/distributed,broxtronix/distributed,amosonn/distributed,blaze/distributed,dask/distributed,broxtronix/distributed,amosonn/distributed,dask/distributed,mrocklin/distributed,amosonn/distributed,dask/distributed,blaze/distributed,broxtronix/distributed,mrocklin/distributed,mrocklin/distributed