add np.atleast_1d call to bbh_average_fits_precessing() in nrutils.py

 -should fix #262
 -all the lower-level fit functions called by this
  wrapper through _return_quantity() already do
  proper vectorizing, so this one line should be
  the only bit that needs a fix
31 jobs for fix-262-lalinference-imrtgr-imrtgrutils-calc_final_mass_spin-failing-on-master in 158 minutes and 28 seconds (queued for 36 seconds)
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