Add bokeh to travis
Add bokeh to travis

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