Remove ipcluster start from Travis-CI.
Remove ipcluster start from Travis-CI.

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