Run slow tests on travis.
Run slow tests on travis.

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