add 1d and 3d tests for concatenate3
add 1d and 3d tests for concatenate3

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