Update dd.read_* functions in docs
Update dd.read_* functions in docs

Add dd.read_hdf and dd.read_table. Fixes #1700.

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