Added pinning demo
Added pinning demo
rshipp/VivaGraphJS,rshipp/VivaGraphJS,aigeano/recommendation-visualizer,rlugojr/VivaGraphJS,hochshi/VivaGraphJS,rlugojr/VivaGraphJS,hochshi/VivaGraphJS,aigeano/recommendation-visualizer,dikshay/VivaGraphJS,dikshay/VivaGraphJS