use BytesIO from io in Python2
use BytesIO from io in Python2

cpcloud/dask,pombredanne/dask,mrocklin/dask,ssanderson/dask,clarkfitzg/dask,vikhyat/dask,jcrist/dask,jakirkham/dask,ssanderson/dask,PhE/dask,pombredanne/dask,vikhyat/dask,mikegraham/dask,wiso/dask,cowlicks/dask,blaze/dask,ContinuumIO/dask,jcrist/dask,wiso/dask,simudream/dask,PhE/dask,simudream/dask,dask/dask,jayhetee/dask,chrisbarber/dask,blaze/dask,clarkfitzg/dask,mrocklin/dask,jayhetee/dask,dask/dask,mraspaud/dask,gameduell/dask,jakirkham/dask,ContinuumIO/dask,mraspaud/dask