Fixes to read_csv for DateTimeIndex; header titles can have spaces; kwarg nrows fix
Fixes to read_csv for DateTimeIndex; header titles can have spaces; kwarg nrows fix

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