modified gitignore to include OS DS_Store files
modified gitignore to include OS DS_Store files

YaleOutdoors/reservations,Amalanag/reservations,YaleOutdoors/reservations,Amalanag/reservations,YaleSTC/reservations,YaleSTC/reservations,Amalanag/reservations,YaleOutdoors/reservations,YaleSTC/reservations