add name= keyword to from_pandas
add name= keyword to from_pandas

Fixes #1119

jakirkham/dask,mrocklin/dask,mrocklin/dask,cowlicks/dask,ContinuumIO/dask,jcrist/dask,dask/dask,chrisbarber/dask,gameduell/dask,blaze/dask,mraspaud/dask,jakirkham/dask,jcrist/dask,mikegraham/dask,ContinuumIO/dask,cpcloud/dask,blaze/dask,dask/dask,mraspaud/dask