Add grid cell accuracy notebook
Add grid cell accuracy notebook

neuroidss/nupic.research,numenta/htmresearch,neuroidss/nupic.research,numenta/htmresearch,neuroidss/nupic.research,subutai/htmresearch,neuroidss/nupic.research,subutai/htmresearch,neuroidss/nupic.research,subutai/htmresearch,subutai/htmresearch,subutai/htmresearch,numenta/htmresearch,subutai/htmresearch,neuroidss/nupic.research,numenta/htmresearch,numenta/htmresearch,neuroidss/nupic.research,subutai/htmresearch,neuroidss/nupic.research,numenta/htmresearch,numenta/htmresearch,subutai/htmresearch,numenta/htmresearch